Your baby won't sleep.
Yet again. You're tired. You feel helpless – desperate to help your baby sleep...

A practical check before you change everything

Baby Won't Sleep? 10 Common Reasons—and What to Try Tonight

1. Your baby is moving through a sleep cycle

   Babies move between lighter and deeper sleep. A brief cry, wiggle, eye flutter, or small sound does not always mean your baby is fully awake. If your baby is safe and appears comfortable, pause briefly and watch what happens. Respond when they are clearly awake or need feeding, comfort, or care.

   Learn more about baby sleep cycles by age.

2. Your baby is hungry or needs a feed

   Night feeding remains normal for many babies, especially newborns. Follow your baby's hunger cues and any feeding or growth plan from their clinician. Do not delay a needed feed to protect a schedule, add cereal to a bottle to make sleep last longer, or intentionally reduce night feeds without individualized guidance.

3. The sleep attempt is too early—or too late

   A baby who is not ready for sleep may resist bedtime. An overtired baby may also become fussy and difficult to settle. Those two situations can look surprisingly similar.

   Use the sleep that actually happened—not a rigid online wake-window chart—to choose the next sleep opportunity. If the same pattern repeats, try moving bedtime or the next nap by a small amount instead of changing the entire day at once. Our guide to why babies fight sleep can help you separate the clues.

4. The evening is still too stimulating

   Bright light, active play, screens, loud voices, and repeated changes of activity can make bedtime feel abrupt. Turn the evening toward sleep gradually: lower the lights, quiet the room, slow the pace, and use the same calm cue each night.

   Nighttime feeding and diaper care can stay quiet and low-key without withholding attention or care.

5. Bedtime does not have a recognizable sequence yet

   A routine does not need to be long or elaborate. A short sequence that another caregiver can repeat is enough: meet feeding needs, change the diaper, put on pajamas or an appropriate sleep sack, share one short book or song, and move to the safe sleep space.

   Consistency makes the transition easier to recognize; it does not guarantee a perfect night. Use our flexible baby sleep schedule if the entire day feels unpredictable.

6. Something in the sleep environment changed

   Check for light, household noise, a wet diaper, uncomfortable clothing, or a room that feels too warm. Dress your baby in no more than one additional layer than an adult would wear comfortably in the same room. Sweating, flushed skin, or a hot chest can signal overheating.

   Use clothing or a correctly sized wearable blanket for warmth—not a loose blanket in the sleep space.

7. The transfer into the crib or bassinet wakes your baby

   Some babies settle in a caregiver's arms and become fully alert during the move to a different surface. Slow the transition and keep the final cues predictable.

   For babies about four months and older, placing them down while drowsy but still awake is one option to experiment with. It is not a developmental test, and a baby who still needs rocking, feeding, holding, or another responsive form of support has not “failed” sleep.

8. Reflux or feeding discomfort may be bothering your baby

   Spit-up is common in infancy and is often painless. If your baby appears distressed during or after feeds, has trouble feeding, arches repeatedly, gains weight poorly, or has worsening vomiting, contact their clinician.

   Even with reflux, sleep should remain flat and on the back. Do not incline the crib or use wedges, nests, or sleep positioners. Seek prompt care for green or bloody vomit, forceful vomiting, poor feeding, or signs of dehydration.

9. Your baby may be uncomfortable or unwell

   A sudden sleep change can accompany congestion, fever, an ear infection, pain, or another illness. Ear pulling alone does not diagnose an ear infection, but fever, increased crying—especially when lying down—ear drainage, or a clear change from your baby's usual behavior deserves medical advice.

   Call your pediatrician immediately if a baby three months or younger has a rectal temperature of 100.4°F (38°C) or higher. Get urgent help for trouble breathing, blue or gray color, unusual limpness, a seizure, or a baby who is extremely difficult to wake.

10. Sleep is changing with age and development

    Sleep organization changes throughout the first year. New movement, separation awareness, travel, illness, or a nap transition can temporarily change settling and waking. That does not prove a scheduled “regression” or mean the routine has stopped working.

    Keep the safe sleep setup and a few familiar bedtime cues steady. Look for a pattern across several days before rebuilding the schedule. The first-year baby sleep schedule explains how expectations change without assigning every baby the same clock.

Educational information only—not a diagnosis or individual medical advice. Safe-sleep guidance reviewed against current American Academy of Pediatrics and CDC resources.