Circumcision causes real pain in newborns, and the outdated idea that babies cannot feel or remember pain has been thoroughly debunked. Newborns have fully functional pain-signaling pathways by the second trimester of pregnancy, and their ability to dampen those signals is actually less developed than in older children or adults, making them more sensitive to painful procedures rather than less. The good news is that several effective pain-management strategies exist, and medical guidelines now explicitly state that adequate analgesia should always be provided when circumcision is performed.
How We Know Newborns Feel Pain
For much of the twentieth century, doctors assumed that neonates either could not feel pain or would simply forget it. Circumcisions were routinely done without any anesthesia at all. That assumption collapsed as researchers documented unmistakable physiological and behavioral responses. A systematic review in the European Journal of Pediatrics put it plainly: ascending neural pathways for detecting painful stimuli are well developed by mid-pregnancy, while the descending pathways that modulate and dampen pain signals remain immature even in full-term newborns.1PubMed Central. Management of pain in newborn circumcision: a systematic review In practical terms, a newborn’s nervous system is wired to detect a painful stimulus at least as well as an adult’s but is worse at turning down the volume on that signal.
The evidence shows up in measurable ways during circumcision. In one early study, vagal tone dropped significantly during the procedure, while the pitch of infants’ cries rose in parallel, a pattern characteristic of severe stress.2PubMed. Newborn pain cries and vagal tone: parallel changes in response to circumcision Heart rate climbs, respiratory rate increases, oxygen saturation can fall, and cortisol levels spike. These are not vague discomfort signals. They track closely with what adults exhibit during acutely painful experiences.
Behavioral markers are just as clear. When newborns experience pain, researchers consistently observe a set of facial movements: brow bulge, eye squeeze, nasolabial furrow deepening, open lips, stretched mouth, and chin quiver. These features appear in more than 90% of neonates undergoing painful stimuli, and between 95% and 98% of full-term newborns show at least the first three movements during acute procedures.3PubMed Central. Face-based automatic pain assessment: challenges and perspectives in neonatal intensive care units Pain assessment scales used in hospitals incorporate these facial features alongside crying duration and vital-sign changes to produce a composite pain score.
The Foreskin’s Nerve Supply
One reason circumcision is painful is that the foreskin is innervated tissue. Histological analyses have identified free nerve endings in the papillary dermis of the foreskin, along with Meissner-like corpuscles and capsulated structures resembling Pacinian corpuscles.4PubMed. Terminal innervation of the male genitalia, cutaneous sensory receptors of the male foreskin Free nerve endings are the type responsible for detecting pain, while the corpuscular receptors handle touch and pressure. The tissue being cut and clamped is, in other words, genuinely sensory.
There is, however, an interesting age-related wrinkle. A histological comparison of foreskin samples from children aged zero to three versus those aged six to eleven found that the younger group had considerably lower sensory innervation across all receptor types: fewer Meissner’s corpuscles, fewer Pacinian corpuscles, fewer Ruffini endings, and fewer free nerve endings.5Journal of Pediatric Urology. Foreskin neurovascular structure: A histological analysis comparing 0–3 years and 6–11 years children This does not mean neonatal circumcision is painless. It means the local nerve density in foreskin tissue is lower in very young children compared to older ones, which could be one reason why neonatal circumcision is considered less risky and less painful than circumcision performed later in childhood, alongside the faster healing and simpler technique possible in newborns.
Dorsal Penile Nerve Block
The dorsal penile nerve block (DPNB) is one of the most studied anesthetic options for neonatal circumcision. It involves injecting a local anesthetic, usually lidocaine, at the base of the penis to block the two dorsal nerves that supply sensation to the foreskin. The results are dramatic compared to no anesthesia. In a trial of low-birth-weight neonates, 80% of infants who received a DPNB stayed quiet during foreskin clamping and only 18% cried, compared to 95% of control infants who cried and were inconsolable.6Archives of Pediatrics & Adolescent Medicine. Dorsal Penile Nerve Block vs Topical Placebo for Circumcision in Low-Birth-Weight Neonates Heart rate, respiratory rate, and behavioral pain scores were all significantly better in the block group.
A meta-analysis pooling results from multiple trials confirmed that DPNB produces lower pain scores than topical anesthetic cream (EMLA) during circumcision. But it comes with a tradeoff: the block significantly increases the risk of minor hematoma at the injection site.7PLOS ONE. Dorsal penile nerve block versus eutectic mixture of local anesthetics cream for pain relief in infants during circumcision: A meta-analysis A separate network meta-analysis also found a higher hematoma risk with DPNB compared to topical cream.8Journal of Perinatology. Local anesthetic techniques for analgesia in neonatal circumcision: a network meta-analysis These hematomas are generally small and self-resolving, but they are worth noting because they represent the most common complication specific to the block itself rather than to the circumcision.
One limitation of DPNB is that it does not cover every stage of the procedure equally well. A randomized trial comparing multiple methods found that while DPNB reduced crying and heart rate throughout most of the circumcision, it was not fully effective during foreskin separation and the initial incision.9PubMed. Comparison of ring block, dorsal penile nerve block, and topical anesthesia for neonatal circumcision: a randomized controlled trial The dorsal nerves supply the top of the penis well, but the frenular area on the underside may not be fully anesthetized.
Ring Block
A ring block involves injecting local anesthetic in a circumferential ring around the base of the penis, which numbs all the nerve branches rather than just the dorsal pair. In the same randomized trial mentioned above, the ring block was equally effective through all stages of circumcision, including foreskin separation and incision, where DPNB and topical cream fell short.9PubMed. Comparison of ring block, dorsal penile nerve block, and topical anesthesia for neonatal circumcision: a randomized controlled trial That across-the-board coverage makes it a favorite among many practitioners.
Comparisons of ring block and DPNB on parental satisfaction and overall analgesic effect have found the two methods to be similar in terms of outcomes and parent-reported satisfaction.10PubMed. Comparison of the effects of ring block and dorsal penile nerve block on parental satisfaction for circumcision operation in children: randomized controlled trial A study comparing multiple postoperative analgesic methods also found no significant differences in pain scores, heart rate, or respiratory rate at 30, 60, 120, and 180 minutes after circumcision between commonly used approaches.11PubMed Central. Postoperative pain management for circumcision; Comparison of frequently used methods In practice, the choice between ring block and DPNB often comes down to the clinician’s training and comfort level. Both work well, and both involve a needle stick that itself causes brief pain before the anesthesia takes effect.
Topical Anesthetics
EMLA cream, a mix of lidocaine and prilocaine, is the most widely studied topical option. It gets applied to the foreskin and left under an occlusive dressing for 60 to 90 minutes before the procedure. A Cochrane review found that EMLA reduced the heart-rate increase during circumcision by about 12 to 27 beats per minute compared to placebo, along with less crying and lower facial-action scores.12Cochrane Database of Systematic Reviews. Lidocaine‐prilocaine cream for analgesia during circumcision in newborn boys So EMLA clearly helps compared to nothing at all.
But head-to-head trials consistently show it is less effective than injectable blocks. One randomized controlled trial found that neonates receiving DPNB had pain scores of about 2.3 on a standard scale compared to 4.8 for those receiving EMLA, and heart rate increased by only 9 beats per minute in the DPNB group versus 49 beats per minute in the EMLA group. Infants circumcised without any anesthesia scored in the severe-pain range.13PubMed. Analgesia for neonatal circumcision: a randomized controlled trial of EMLA cream versus dorsal penile nerve block EMLA is better than nothing but falls meaningfully short of what an injectable block can achieve. Its main advantage is that it does not require a needle, which can be appealing to parents and may be the only option when a trained provider for nerve blocks is unavailable.
Sucrose and Non-Drug Comfort Measures
Giving a newborn a sucrose-dipped pacifier is a long-established comfort technique in neonatal care. A concentrated sucrose solution (usually around 24–30%) placed on the tongue triggers endogenous opioid release and has a calming effect. One trial comparing sucrose to glucose solutions and placebo found that sucrose reduced mean crying time to about 60 seconds compared to roughly 100 seconds in the other groups.14The Journal of Pain. Comparison of Oral Glucose and Sucrose Solutions on Pain Response in Neonates
Other non-drug measures include swaddling, skin-to-skin contact, and non-nutritive sucking (giving the baby a pacifier without sucrose). These techniques do provide some comfort. However, the American Academy of Pediatrics (AAP) has stated explicitly that non-pharmacologic techniques alone are insufficient to prevent procedural and postprocedural pain from circumcision and should not be used as the sole method of pain management.15PubMed. Male circumcision Sucrose and swaddling are best thought of as add-ons to proper anesthesia rather than replacements for it.
Why Combining Methods Works Best
The strongest pain control comes from layering multiple approaches together. A randomized controlled trial tested several combinations and found that infants receiving a ring block plus EMLA cream plus sucrose had the lowest pain scores of any group, with a mean around 2.45 on the Neonatal Infant Pain Scale. That was significantly better than EMLA plus sucrose alone (mean around 3.1) and better than EMLA plus sucrose plus DPNB (mean around 3.0). The control group, receiving only sucrose, scored around 5.5.16Pediatrics. Combination Analgesia for Neonatal Circumcision: A Randomized Controlled Trial Every added layer chipped away at the pain score. The AAP’s policy statement reinforces this approach, calling for effective pain management as a standard part of any circumcision.15PubMed. Male circumcision
Which Surgical Device Matters Too
The clamp or device used for circumcision affects how long the procedure takes, and longer procedures mean more time for the baby to experience discomfort. The three common devices in neonatal circumcision are the Gomco clamp, the Mogen clamp, and the Plastibell. A randomized trial in Botswana found that the Mogen clamp required an average of about 5.5 minutes compared to about 7 minutes for Plastibell.17PubMed Central. A Randomized Trial of Mogen Clamp versus Plastibell for Neonatal Male Circumcision in Botswana
A separate trial directly comparing Mogen to Gomco found that Mogen circumcisions were faster, averaging under 4 minutes versus 7 minutes for Gomco. The Mogen group also had a lower cortisol spike and lower postoperative heart rate and blood pressure.18American Journal of Obstetrics and Gynecology. The GoMo study: a randomized clinical trial assessing neonatal pain with Gomco vs Mogen clamp circumcision A shorter procedure means less cumulative stress, even with effective anesthesia. If you are a parent asking about circumcision, asking which device your provider uses and how long the procedure typically takes are reasonable questions.
Pain After the Procedure
Pain management does not end when the clamp comes off. The circumcision site remains a healing wound for several days, and newborns show signs of discomfort during diaper changes and when the area is touched. The AAP recommends that post-procedural pain also be addressed.15PubMed. Male circumcision
Acetaminophen (infant Tylenol) is commonly given after circumcision, but the evidence for its effectiveness in the immediate postoperative window is surprisingly weak. A trial found no significant difference in comfort scores between the acetaminophen and placebo groups in the first several hours after circumcision. It was not until about six hours post-procedure that the acetaminophen group showed significantly improved scores.19PubMed. Acetaminophen analgesia in neonatal circumcision: the effect on pain Acetaminophen does not appear to help with the acute procedural pain or the first few hours of postoperative discomfort, but it may offer some relief later on. For the immediate post-procedure period, the residual effect of a nerve block and continued non-pharmacologic comfort measures like swaddling and feeding are probably doing most of the heavy lifting.
Can Circumcision Pain Have Lasting Effects?
One of the more unsettling findings in this area comes from research on pain response during routine vaccinations months after circumcision. A study tracked boys who had been circumcised as newborns, some with EMLA cream and some without anesthesia, alongside uncircumcised boys. At their four-to-six-month vaccinations, the circumcised boys who had received no anesthesia during circumcision showed significantly stronger pain responses: roughly double the percentage of time spent crying and notably higher facial-action scores compared to uncircumcised boys. Boys who had been circumcised with EMLA fell in between, suggesting the anesthetic partially buffered against this effect.20The Lancet. Effect of neonatal circumcision on pain response during subsequent routine vaccination
This finding has been interpreted as evidence that early painful experiences may alter pain processing in infancy, at least for a period of months. Whether these differences persist beyond infancy is less clear, and it would be a stretch to extrapolate from vaccination pain scores to any broader claim about long-term psychological impact. But the study does underscore why adequate pain management during circumcision matters beyond just the procedure itself. Effective anesthesia is not only about minimizing suffering in the moment; it may also shape how the infant processes pain in the weeks and months that follow.
Measuring Pain in Babies Who Cannot Report It
One challenge in neonatal pain management is that babies cannot tell you how much they hurt. Clinicians rely on indirect measures: crying, facial expression, vital signs, and validated scales that combine these indicators. Emerging research is exploring objective brain-based measurement. A study using functional near-infrared spectroscopy (fNIRS), a technology that measures changes in brain oxygenation through the scalp, found that neonates showed significant increases in brain blood flow during the painful stages of circumcision, such as local anesthetic injection and clamp application. During non-painful stages like skin preparation, brain activity decreased.21PubMed. Functional near-infrared spectroscopy to assess pain in neonatal circumcisions This kind of technology could eventually help clinicians assess in real time whether an anesthetic is working, rather than relying entirely on behavioral cues that can be ambiguous in a distressed newborn.
Risks of the Anesthesia Itself
Local anesthetics are not without risk. The hematoma risk with DPNB has already been mentioned. On a more serious level, if local anesthetics are absorbed into the bloodstream in sufficient quantities, they can affect the central nervous system and cardiovascular system.22Journal of Anesthesia & Pain Medicine. Serious Side Effects of Local Anesthetics’s Absorption in Blood Stream In practice, the doses used for neonatal circumcision are small, and systemic toxicity from a penile nerve block or ring block is extremely rare. EMLA cream carries a theoretical risk of methemoglobinemia (a condition where the blood carries less oxygen) from the prilocaine component, though at the doses used for circumcision this is also very uncommon. The risks of anesthesia are real but small, and they pale beside the documented harm of performing circumcision with no pain control at all.
Parental Anxiety and the Experience in the Room
Parents often worry intensely about their baby’s pain during circumcision, and that anxiety is not irrational. Hearing your infant cry during a medical procedure is distressing. A randomized trial examined whether a nurse-led educational intervention before circumcision could reduce parental anxiety. Children in the intervention group had lower pain scores on the FLACC scale compared to the control group, with the difference consistent across caregiver education levels.23PubMed Central. Nurse-Led Intervention to Reduce Parental Anxiety and Child Pain During Non-Therapeutic Male Circumcision: A Randomized Trial One explanation is that less anxious caregivers were better able to soothe their children before and after the procedure, which itself contributed to lower pain scores.
If you are preparing for your child’s circumcision, asking the provider specific questions about their pain-management protocol is the most useful thing you can do. Key questions include what anesthetic method they use, whether they combine approaches (a nerve block plus topical cream plus sucrose is the gold standard), how long the procedure typically takes, and what they recommend for pain control afterward. A provider who plans to use only a topical cream, or worse, only a pacifier dipped in sugar water, is not following current best-practice recommendations. You are well within your rights to ask for more.