Many parents find success using resources like Precious Little Sleep, a well-known guide for creating age-appropriate sleep routines. For example, at 4 months old, babies typically need 3–4 naps a day with 10–12 hours of nighttime sleep. Creating a predictable 4 month old sleep schedule helps regulate their natural rhythms and leads to longer stretches of rest. https://coast2coastsleeptraining.com/the-role-of-baby-sleep-consultant-in-southern-california/