Sleep Regression Timeline
Enter your baby's birthday to see when each sleep regression is likely to hit — mapped to actual dates on your calendar.
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When is your baby's birthday?
4 months
2–6 weeksSleep architecture rewires
Your baby's sleep shifts from two simple stages to four adult-like cycles. They now surface between ...
8–10 months
2–4 weeksMotor milestones + separation anxiety
Pulling up, crawling, and cruising keep your baby's brain buzzing at 2 AM. Add in separation anxiety...
12 months
1–3 weeksNap transition confusion
Your baby might refuse one of their two naps, making it look like they're ready for one nap. They're...
18 months
2–4 weeksOpinions, FOMO, and boundary testing
Your toddler now has strong preferences and the word "no." Separation anxiety hits another peak. The...
2 years
2–6 weeksFears, dreams, and big-kid transitions
Imagination kicks in, which means nightmares and new fears (the dark, monsters, loud noises). Some f...
Sleep regressions are normal developmental phases, not problems to fix. Every baby is on their own timeline. Talk to your pediatrician if you're concerned about your baby's sleep.
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