For a 4 month old, these are their feeding schedules
Breastfed Babies: 6-10 feedings per day, each feed of 10-20 minutes
Formula-fed Babies: 5-6 ounces (120-150 mL), 5-6 feedings per day
Since all babies are not the same and their needs differ, look out for signs that tell you your baby is hungry, like licking or puckering their lips, sucking on their thumbs, or moving towards your chest.