I also had the same trouble with my baby up until she's 12mons old. But being a picky eater she is adds on the dilemma. Try to get your baby to relax during feedings and don't push him to eat more than he's inclined to. But sometimes baby pushing the food out of his mouth doesn't necessarily mean that he doesn't like it — he's probably just trying to figure out this new way of eating.
We have to feed them slowly while he gets the hang of it. Reserve more patience just like me :)
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