How long does the 4-month sleep regression usually last?

Most regressions last 2 to 6 weeks. The duration depends on how consistently you apply a supportive routine and whether your baby learns to self-settle. If it persists beyond 6 weeks, consult your pediatrician to rule out other issues.

Should I feed my baby every time they wake at night during the regression?

Not necessarily. If your baby ate well during the day and wakes before 3 hours have passed since the last feed, try soothing them back to sleep without feeding—use a pacifier, gentle patting, or shushing. Only feed if hunger cues are clear and at least 3 hours have passed.

Can I let my 4-month-old cry it out?

Full extinction (crying it out) is generally not recommended before 4–6 months by the AAP. At 4 months, gentle methods like fading or pick-up/put-down are safer and still effective. Always consult your pediatrician before choosing any sleep training approach.

My baby only naps 30 minutes—is that normal at 4 months?

Yes, short naps are common during the regression because sleep cycles are only about 45 minutes. Focus on 90–120 minute wake windows and drowsy-but-awake transfers. Naps typically lengthen over the following weeks as your baby learns to connect cycles.

Will starting solids early help my baby sleep through the night?

No. Multiple studies, including guidance from the AAP, show no sleep benefit from solids before 6 months, and early introduction poses choking and digestive risks. Stick to breastmilk or formula until at least 6 months.

Will the regression happen if my baby already self-settles?

Yes, but it is usually much milder. Babies who already fall asleep independently typically have 3–7 rough nights rather than weeks of disruption.

Can I sleep train at 4 months?

Yes—gentle, responsive methods are safe at this age according to current AAP and Cochrane evidence. Avoid hard extinction with very young infants if you can support a graduated approach instead.

Should I drop a nap during the regression?

No. At 4 months most babies still need 3–4 naps. Dropping naps too early worsens overtiredness and night waking.

My baby suddenly hates the swaddle—what now?

If your baby is showing rolling signs (or has rolled), transition out of the swaddle immediately to a transition sleep sack with arms free for safety.