At 3 months what is the average amount a baby should be drinking and between what time frame?

Feedings: babies at this age should be drinking between 20-25 oz of formula per day

Four to six ounces: Somewhere in the ballpark of four to six ounces every four to six hours. This is a rough ballpark. Your baby's growth curve will let us know also about the appropriateness of growth, so be sure and make your four month appointment with your pediatrician.