I feed babies as much as they will eat in about 5 minutes at each feeding. Make sure the food is an appropriate size and dusted with a phos. free calcium powder at most feedings, a phos. free calcium/D3 powder lightly twice a month and a vitamin powder with a beta carotene (prOformed) source of vitamin A. You can use a vitamin powder with a prEformed source of vitamin A occasionally if you want to but be careful with preformed vitamin A because it can build up in the system. Same with the D3.