@kzp, Hoping for the best! If your concerned with his weight after you find out what it is don't be shy about asking his doctor if that's still a healthy weight for him and if the doctor wants him to gain more weight I'm sure he'll tell you how to help him along. (:
Thanks Hun... If he lost weight hopefully it's not too much @hitt_andrea I started breastfeeding then switched to formula so I hope that helped him gain or keep weight. He wouldn't eat before I gave him formula