Happening around 3-4 months, this is the first of the sleep regressions and is often times the hardest one for parents. During this regression, your baby, who was previously sleeping longer stretches at night, will begin waking more frequently throughout the night and struggling at nap times, often only taking 30-45 minute naps or resisting naps entirely. Why does the 4 month regression happen? By around 4 months old, your baby is going through a lot of developmental changes.
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