Oct 13, 2016 Estimated energy requirements developed by the USDA are as follows: 5. Males. 1 to 3 months: 472 to 572 calories per day; 4 to 6 months: 548 to 645 calories per day; 7 to 9 months: 668 to 746 calories per day; 10 to 12 months: 793 to 844 calories per day; Females. 1 to 3 months: 438 to 521 calories per day; 4 to 6 months: 508 to 593 calories per day