same with my bb when he was 3mths old... he's been 厭奶 since 2mths old ga la... till now, sometimes he doesn't want to drink... 2weeks ago, he was drinking like 16-19oz per day but from last week till now, he finishes all his milk and asks for more... he's drinking 25-28oz per day... i havne't done anything different... just seems that he has the apetite to drink.... ?-(
i know it can be very worrying, but i guess your bb will also suddenly drink more later on... just be patient with him & don't force him to drink...