what sort of nappies does he have, wet? dirty? how often? have you got some where you can go weigh him? you can also do this at home. step on to the scales holding him and then put him down and weigh your self. see what the difference is. it's not that accurate but it will give you an idea. remember i said if the are in pain with gas then they will want to be at the breast all the time, is this why you think you don't have enough milk? you could also do a yield, pump yourself, see how much you get, then give it to him and see how much he drinks. there is a milk calculator link on the breastfeeding forum and it can calculate how much he should be consuming, this could also give you an idea. good luck and keep us posted! nicola