16 to 20 month Toddler Sleep Regression and Night Waking
The 4 month sleep regression begins between 3 and 4 months of age or weeks of age. During this time, your baby's sleep patterns are starting to change. After 16 weeks, most babies do best on a 3-nap schedule (morning, mid-day and later afternoon catnap) with bedtime approximately hours after the last nap.
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