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Just when sleep starts to feel predictable, everything seems to unravel. Longer nights disappear, naps shorten and frequent waking becomes the new normal. The 4-month sleep regression is not a setback, but a sign of major brain and sleep development taking place. Babies begin cycling through sleep differently, which can feel exhausting for everyone. Knowing what is happening can ease anxiety and help parents approach this phase with more confidence and patience.
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