FTM: Feeding a 2-3month old, help!!

Ta
my LO is 9 weeks and has been tryi g to change his own schedule. i let him eat and sleep as he wants. anyway, im becoming concerned how much he should be eating. when he feeds from bottles its anyway from 4.5oz~5.5oz what he is content at.. a week ago he weighed 10lbs even however i have no idea how much he should be eating... how many times per day and about how many oz per feeding. i know all babies are different but I'd like to hear how your babies eat.