Your baby at week 12: 3-month update — what to expect

At week 12, 3-month update. Sleep pattern: more predictable rhythms. Feeding: wake windows ~75min. Special note: 2 longer naps.

What week 12 typically looks like

At 3-month update, most babies show more predictable rhythms and wake windows ~75min. 2 longer naps. Wermom data from 50,000+ tracked babies confirms this range — though every baby is on their own timeline.

Sleep patterns this week

Typical wake windows at week 12 run 60-120 minutes depending on baby's individual rhythm. Total 24-hour sleep target: 14-17 hours. Track wake windows in your sleep app to identify your baby's specific pattern.

Feeding rhythms

At week 12, expect wake windows ~75min. Watch for early hunger cues: rooting, hand-to-mouth, soft fussing. Late cues (crying) mean you missed the window. Logging cue + time pattern over 7 days reveals your baby's rhythm.

Milestone watch

This week: 3-month update. AAP guidelines specify a range, not a date. Babies on either end of normal are still normal. Document what your baby does — for your reassurance and for your pediatrician check-in.

Red flags worth a pediatrician call

Sudden total sleep drop (<11h sustained 5+ days). Refusing feeds for 24+ hours combined with fewer wet diapers. Significant loss of previously-shown skills. When in doubt, the AAP recommends call. Worst case: you confirm everything's fine.