Normal newborn food intake

My LO is 2.5 weeks old and today are 20 oz of pumped breast milk as well as two full breast feeding sessions at 15 minutes each breast and a little snack where he only ate for 8 min on one breast. Is this considered a large amount of food intake or pretty normal? Also in the mornings first thing if I pump I can get nearly 5 oz, by day's end I slow down and only pump about 3-3.5 oz is this normal or any ideas as to why? FTM here and just needing a little information on the subject. Thanks everyone!