I have a 6.5 week old baby. At night he will eat 3-4 oz every 3-4 hours but during the day he seems like eats all day but in small amounts. I'll feed him and he will only eat an oz or two. Then he will be hungry agian within next hr or two. I can't get him to eat more so he just hungry all the time. Is this normal? How can I get him to eat more at a time and go longer between feelings?