Evidence-Based Maternal Health: Fact-checked and aligned with ACOG & AAP clinical protocols.
Why your baby’s sleep architecture changes permanently around 16 weeks, and gentle pediatric methods to establish circadian rhythms.
The 4-month sleep regression is not actually a setback—it is a permanent maturation of your infant's brain from 2 newborn sleep stages into the 4-stage adult sleep architecture.
1. Understanding the Neurological Sleep Shift
Between 14 and 18 weeks, babies begin experiencing lighter Non-REM stages (N1 and N2) and sleep cycles shorten to 45–50 minutes. When cycling between sleep phases, babies wake and look for the exact conditions present when they initially fell asleep.
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