Most experts recommend waiting at least 18 months after giving birth before conceiving again. That 18-month mark is where the greatest benefits appear for both the birthing parent and the next baby. Getting pregnant sooner than 6 months after delivery carries the highest risk of serious complications, making that the absolute minimum spacing to avoid.
The “interpregnancy interval” is measured from your delivery date to the start of your next pregnancy, not from birth to birth. So if you’re aiming for 18 months of spacing, your children would end up roughly 27 months apart in age.
Why 18 Months Is the Sweet Spot
Pregnancy draws heavily on your body’s stored nutrients, especially folate and iron. Without supplementation, folate levels can remain depleted for at least six months postpartum, and that timeline extends further if you’re breastfeeding. When your body hasn’t fully replenished these stores, the next pregnancy gets shortchanged. Research shows that in a state of nutrient depletion, the body prioritizes the mother’s needs at the expense of the developing fetus.
Conceiving within six months of a prior birth has been linked to congenital malformations and other adverse outcomes in the next pregnancy. By 18 months, your nutrient stores have had time to recover, your uterus has fully healed, and the risks to both you and the baby drop significantly. The range of 12 to 24 months generally carries comparable levels of risk, so you don’t need to hit exactly 18 months to be in a good zone.
Waiting After a Cesarean Birth
If your previous delivery was a C-section, spacing matters even more. A cesarean creates two incisions: one through the abdominal wall and one through the uterus itself. The uterine incision heals far more slowly than the visible scar on your skin. Getting pregnant too soon after a cesarean raises the risk of uterine rupture during labor, where the old scar tears open under the pressure of contractions. This is a life-threatening emergency.
The minimum recommendation still holds: do not conceive within six months of a cesarean delivery. But the 18-month target is especially important here, giving the uterine tissue enough time to regain its strength before stretching and contracting through another pregnancy and delivery.
Waiting After a Miscarriage
The timeline looks different after a pregnancy loss. For an early miscarriage (first trimester) without complications, current guidance suggests you can start trying again after your next normal period. There’s no need to wait months if you’re physically and emotionally ready.
A later loss, such as a stillbirth or pregnancy loss after five months, requires more recovery time. It can take six weeks or longer for ovulation to resume and the uterus to return to its normal state. In these cases, waiting until your cycle has fully regulated gives your body a better starting point for the next pregnancy.
If You’re Over 35
Women over 35 face a real tension: fertility declines with age, but short intervals still carry measurable risks. A large study found that in women 35 and older, conceiving just 6 months after delivery more than doubled the risk of severe complications compared to waiting 18 months (0.62% versus 0.26%). That’s a small absolute difference, but a meaningful one.
The researchers behind that study concluded that even for women with age-related urgency, an interval of 12 to 18 months strikes the best balance between fertility timing and safety. They acknowledged that many pregnancies spaced closely together in this age group are intentional, but recommended that 12 months be treated as a reasonable minimum rather than rushing to conceive within a few months of delivery.
Can You Wait Too Long?
Very long gaps between pregnancies carry their own considerations. An interpregnancy interval longer than five years has been associated with a higher risk of preeclampsia (dangerously high blood pressure during pregnancy), particularly in women who already experienced it in a prior pregnancy. Some research suggests a two-to-five-year window may be ideal for minimizing that specific risk. That said, at least one study found that the length of the interval didn’t independently predict severe preeclampsia, so the picture isn’t fully settled.
Beyond preeclampsia, gaps of five or more years may mean your body responds to pregnancy more like a first-time pregnancy in some ways, losing some of the physiological “memory” from the previous one. This isn’t a reason to rush, but it’s worth knowing if you’re weighing a long delay.
Mental Health Recovery Matters Too
Physical readiness is only part of the equation. If you experienced postpartum depression or anxiety after your last pregnancy, that history raises your risk of it recurring in a subsequent pregnancy. There’s no specific number of months that guarantees emotional readiness, but conceiving before you’ve stabilized from a postpartum mood disorder puts you at a disadvantage heading into the hormonal shifts of early pregnancy. If you have a history of postpartum depression and are considering another pregnancy, that’s a conversation worth having with your provider before conceiving so that monitoring and support can start early.