You will need to wait and let him get used to the changes before attempting to feed again. In a lot of cases the crumpled newspaper works. It eliminates stress. Try and assist feed before you attempt to force feed, there is a big difference. If you have to get to that point make sure you get advice from here before doing it. I would suggest you get on the phone with a breeder and talk in person before assisting. Most breeders websites will have a phone # for contacting them.