S.H.
http://abcnews.go.com/Nightline/Recipes/extremely-picky-e...
This is an article about 'Food Neophobia" in kids.
I hope this helps.
You might also look into "Apraxia" of eating, which is something which can affect swallowing.
http://www.apraxia-kids.org/site/apps/nlnet/content3.aspx...