Quotes from American Academy of Pediatrics

De Schipper, E. J., J. M. Riksen-Walraven, S. A. E. Geurts. 2006. Effects of child-caregiver ratio on the interactions between caregivers and children in child-care centers: An experimental study. Child Devel 77:861-74.

The average amount he consumes at a feeding will increase gradually from about 4 or 5 ounces (120 to 150 ml) during the second month, to 5 or 6 ounces (150 to 180 ml) by four months, but these amounts vary from baby to baby and from feeding to feeding. His daily intake should range from about 25 to 30 ounces (750 to 900 ml) by four months.