3 month old babies need 11-12 hours of sleep at night and 3 to 4 hours of sleep during the day for a total sleep of 14 to 16 hours of sleep, on average. With over 10 years of experience, we provide you with sample 3-month-old baby schedules, including milk feedings for breastfeeding and formula-feeding babies, solids, naps, and nighttime sleep. 3 Month Old Sleep and Development At 3 months old, your baby is past the newborn stage - quite a milestone! Your baby has been doing a lot of