hi all, my DS is on 3 meals a day. he has alway...

hi all, my DS is on 3 meals a day. he has always loved his solids, and eats with no problems. for the last few days, he's been turning his head away when i go to put some food in his mouth. is this him telling me he doesnt want it? or could it be that he doesnt like what i am offering? he's never done this before!