My son is going through this right now. My Son Brandon is 9 and half months old and a friend said that babies go through this, either because they are going through a growth spurt or they just got done or just about to go through one. Brandon looks like he is going through a growth spurt. He was just at the doctors yesterday for his 9 month check up, and she said he is healthy, so, I then knew that it was because of the growth spurt. I used to give him 3rd foods in the morning ad 3rd foods at night, and 2ed foods in the afternoon. Well, now he is on the 2ed foods in the morning, 2ed foods in the afternoon and 3rd foods at night. I am sure that it will change again.. But I would call and talk to his doctor and see what they say and go from there..
Good Luck! :)