DS is 6.5mths and has been eating solids for th...

DS is 6.5mths and has been eating solids for three weeks. He started off on vegies and then i gave him a taste of some pears 4 days ago. Since then he will not eat any vegies. He gags, pushes it out with his tongue and then lets the rest fall out with his dribble. Will not swallow any of it. When DD started solids, she had vegies for a couple of weeks and then a small taste of fruit, but i never had a problem with her not eating her vegies after tasting it. Please help, what can i do? Thanks