What to do if my toddler has over-sensitive gag reflex?

My toddler is 14 months old and appears for the most part normal when it comes to eating food and drinking milk. The concern is that it appears he has on over-sensitive gag reflex. He would at times at the sight of food or a bottle of milk he would gag. In addition, he could vomit when eating food and does so between 1-5 times weekly. We have consulted with our general pediatrician and they say it is normal. Personally I do not agree with the medical essment and I am considering consulting with a pediatric gastrointernologist. We have been observing the situation for sometime and looking for clues to as what may be causing the situation. We have also considered that we may be overfeeding him but have ruled that out. If anyone can share their similar experience and make a recommendation it would be surely appreciated. Thank you!