Is our 6 week old drinking enough?

Maybe he hasn't read the book! He is fine...they all vary and books don;'t take into consideration that babies are all individuals...he will slowly up his intake as he gets bigger..it is very tiring for them to drink a lot and he knows what he wants. As your HV says he is putting on weight and is happy. Have you got Dr Browns bottles for his colic? Unless of course you are feeding...Dr Brwns really worked with my coliky baby. Good luck!