Please tell me how often to feed a newborn in order for it to stay healthy?

Breastfeed on demand: If you are breastfeeding your newborn, he will want to eat very often, every 1-2hrs, until your milk comes in. After that, he will be be able to wait 2-4h. A formula fed child will eat every 2-4hrs. The amount a baby takes increases with age, from about 1 oz (30 ml) per feed at birth to about 3-4 oz per feed at 4 weeks. You should be checking your baby pees with each diaper and poops 4-7 times/day.