At four months old, your baby may start showing the earliest signs of teething, even though the first tooth typically doesn’t break through until around six months. The process begins well before a tooth appears, so the symptoms you’re noticing now are real, even if you won’t see a white speck on the gums for weeks. The most reliable signs are a combination of increased chewing and gnawing, swollen or tender gums, extra drooling, and fussiness that comes and goes.
What the Gums Look Like
The most direct way to check is to look inside your baby’s mouth. Wash your hands and gently run a clean finger along the gum line. Healthy gums are smooth and pink. When a tooth is working its way up, the gum tissue above it will feel swollen, firm, or slightly raised. You may also see redness in that spot. The lower front two teeth (the bottom center pair) are almost always the first to come in, so start there.
You won’t necessarily see the white edge of a tooth yet. At four months, the tooth may still be deep enough that you only feel a hard ridge under the surface. That pressure is what’s causing your baby discomfort.
Behavioral Signs to Watch For
Babies can’t tell you their gums hurt, but their behavior shifts in predictable ways. The hallmark sign is intense chewing and gnawing on anything within reach: fingers, toys, the edge of a blanket, your shoulder. This isn’t random mouthing. Biting down creates counter-pressure against the gums, which temporarily relieves the ache underneath.
Other common signs:
- Cheek rubbing and ear pulling. Pain from the gums can radiate into the cheek and ear on the same side. Babies instinctively rub or tug at those areas. Keep in mind that persistent ear pulling can also signal an ear infection, especially if your baby also has a fever or seems very uncomfortable.
- Appetite changes. Some babies refuse to nurse or take a bottle because the sucking motion puts pressure on sore gums. Others want to nurse more for comfort. Both patterns are normal during teething.
- General fussiness. Irritability that doesn’t have an obvious cause, comes and goes, and seems worst in the evening or at night is a classic teething pattern.
The Drool Factor
Four-month-olds already drool more than newborns because their salivary glands are maturing, so extra drool alone doesn’t confirm teething. But teething ramps it up further. You’ll notice soaked bibs, damp shirts, and saliva pooling on their chin and in the folds of their neck.
All that moisture sitting on skin causes drool rash, a patchy, red, slightly bumpy irritation around the mouth, chin, or neck. It can look alarming, but it’s just a reaction to prolonged wetness. To prevent it, keep a soft cloth handy and gently blot (don’t rub) drool throughout the day. Once the skin is completely dry, a thin layer of petroleum jelly or a barrier ointment protects the area from the next wave of saliva. Stick with mild, fragrance-free products, and skip medicated soaps on the irritated skin. Warm water is enough for cleaning.
Sleep Disruption During Teething
If your baby was sleeping in longer stretches and suddenly starts waking more, teething is a likely culprit. The discomfort tends to feel worse at night when there are fewer distractions. You may notice your baby is harder to settle or wakes crying after only a short stretch.
The reassuring part: the actual pain from a single tooth typically lasts only about 24 to 72 hours before the tooth breaks through the gum. Once it’s through, most of the discomfort fades quickly. Sleep disruptions from teething are real but temporary. If night waking stretches on for more than a week without improvement, something else may be going on.
What Teething Does Not Cause
A persistent myth is that teething causes fevers. It doesn’t. Teething may nudge your baby’s temperature slightly above their baseline, but it won’t reach 100.4°F (38°C), which is the threshold for a true fever. If your baby’s temperature hits that number or higher, that’s a sign of an infection, not a tooth coming in. For any baby under three months with a temperature of 100.4°F or above, that warrants immediate medical attention.
Teething also doesn’t cause diarrhea, severe congestion, or a full body rash. These symptoms showing up at the same time as teething is coincidence. Babies this age are losing the immune protection they got from their mothers and are catching their first illnesses, which happens to overlap with the teething window.
Safe Ways to Ease the Pain
For a four-month-old, the safest options are simple and physical. Rub your baby’s gums with a clean finger or a piece of damp gauze for about two minutes. The pressure works the same way biting does, relieving discomfort from below. You can do this as often as your baby seems to need it.
Chilled (not frozen) teething rings, pacifiers, or damp washcloths also help. Pop them in the refrigerator, not the freezer. Frozen items can actually cause frostbite on delicate gum tissue. If you use a teething ring, choose one filled with distilled water rather than gel, in case your baby’s emerging teeth puncture it. Always supervise your baby while they chew on anything.
What to Avoid
Several popular teething products carry serious risks. The FDA has warned against all of these for infants:
- Numbing gels containing benzocaine. These can cause a rare but potentially fatal condition where the blood loses its ability to carry oxygen effectively.
- Prescription lidocaine solutions. Even small amounts can cause seizures, heart problems, and severe brain injury in young children.
- Homeopathic teething tablets. Despite being marketed as natural, these have been linked to serious injuries and deaths in children.
- Amber teething necklaces and other teething jewelry. The FDA has received reports of infant deaths from strangulation and choking caused by these products.
Pain relievers like infant acetaminophen are not recommended for babies under two years without specific guidance from a pediatrician, especially at four months. If your baby seems to be in significant pain, call your pediatrician to discuss safe options and dosing for their exact weight and age.
Is Four Months Too Early?
Most babies get their first visible tooth around six months, but the range is wide. Some babies are born with a tooth already through, while others don’t cut one until after their first birthday. At four months, what you’re likely seeing is the early stage of the process: the tooth moving upward through the bone and gum tissue, creating pressure and inflammation well before it surfaces. This pre-eruption phase is what causes symptoms, and it can start two to three months before the tooth actually appears.
So if your four-month-old is gnawing on everything, drooling through bibs, fussy without an obvious reason, and has swollen or red gums along the lower front, teething is the most likely explanation. You may just need to wait a bit longer before you see the tooth itself.