my LO is 9.5 months now and he was a good solid eater.but suddenly he started refusing all kind of food even the one he used to enjoy the most.and he spend a very short time nursing too.What is going on?and how should i encorge him to go back to eat like he used to be?I dont think he is teething now,he already got the first upper 4 and the 2 bottom ones and no sign of others