Resources Month by Month · Sleep

Baby & toddler sleep, age by age.

Baby sleep changes almost every month in the first two years. Wake windows stretch, naps drop on a rough schedule, and regressions arrive with developmental leaps. These guides cover what is normal at each age, how much sleep your child needs, and how to read their cues, in line with AAP and pediatric sleep-medicine guidance. None of this replaces your pediatrician.

Baby sleep by age, plus schedules and methods

Sleep changes quickly in the first two years: wake windows stretch, naps consolidate, regressions often appear around developmental shifts, and preschool sleep becomes more about routine and screens. Start with the age guide, then use the tools and method comparisons for the specific problem you are solving.

Age guides

Newborn sleep — why newborn sleep has no clock yet.
Wake windows — how long babies can usually stay awake by age.
4-month sleep regression — the sleep-cycle shift and how to ride it out.
2-to-1 nap transition — signs your baby is ready and how to move gradually.

Tools and decisions

Wake window calculator — a fast estimate by age.
Bedtime calculator — plan bedtime from the day's sleep.
Sleep training methods compared — what each method asks of parent and child.
Cry it out vs Ferber — the practical difference between two common approaches.

Year 1

NewbornWhy silence is the enemy of newborn sleep→ NewbornNewborn sleep: no clock, only instinct→ NewbornMom sleep matters, too→ 1 monthWhy overtired babies can't sleep→ 1 monthThe witching hour is not just fussiness→ 2 monthsMastering wake windows→ 3 months3-month sleep: preparing for the 4-month change→ 4 monthsThe 4-month regression is actually a progression→ 4 monthsBaby sleep is a wave, not a straight line→ 5 months5-month sleep: naps & settling after the regression→ 6 months6-month sleep: dropping to ~2 naps→ 7 months7-month sleep: teething, rolling & night wakes→ 8 months8-month sleep & the 8–10 month regression→ 9 months9-month sleep: separation anxiety & standing→ 10 months10-month sleep: holding the 2-nap schedule→ 11 months11-month sleep: pre-toddler naps & bedtime battles→ 12 months1-year-old sleep: naps & the 12-month regression→

Year 2

15 months15-month sleep: time to drop to one nap?→ 18 months18-month sleep & the 18-month regression→ 21 months21-month sleep: one nap & routines that stick→ 2 years2-year sleep: the 2-year regression & crib-to-bed→

3–6 yr

3 years3-year sleep: dropping the nap & night fears→ 4 years4-year sleep: no-nap days & nightmares→ 5 years5-year sleep: school routines & sleep hygiene→ 6 years6-year sleep: screens & consistent bedtimes→

Sleep science

0–24 moAre sleep regressions real? The honest answer→ 0–20 moAre the Wonder Weeks 'leaps' real?→

Sleep training & schedules

MethodSleep training methods compared→ MethodCry it out vs the Ferber method→ ScheduleSample sleep schedules by age→ NapsThe 2-to-1 nap transition→ FeedingHow to night wean your baby→ TransitionBassinet to crib transition→

Browse all guides by age →