Breastfeeding! Help

Mikayla

My son is 11 days old and i keep getting different answers as to how much he should be eating (ounce wise) i have been having trouble breastfeeding so i currently pump and bottle feed. His eating is so all over the place sometimes he only wants an ounce and other times he can do 4 ounces. I’m feeling frustrated that I’ve been told an ounce isn’t enough and 4 oz is too much... any thougts?