Every baby's sleep needs change as they grow, and thats completely normal. A newborns naps will be shorter and more frequent while an older infant may begin consolidating into fewer and longer naps.

Sleepy baby, crying out, awake in the middle of the night. Baby is wearing a tan onesie and grey hat. There's nothing quite like finally...

Aroung 4 months, your baby's sleep cycle matures. Instead of drifting in and our of deep newborn sleep, they now cycle through lighter and deeper stages of sleep, just like adults do.