My boys, who were really big kids (95%tile on weight) and who had a mouthful of teeth, didn't eat solid food until they were 18 or 19 months old. My oldest would eat a tiny bite of banana or one tiny bite of a toast on a given day before then. My youngest (who also gagged a lot and threw up once) didn't eat anything except breastmilk until 19 months. They wouldn't eat babyfood. I am a small person with small breasts. Not only were they fine, but they had gorgeous skin, robust immune systems, beautiful smiles and they continued to grow like weeds.
I didn't set out for that to happen. I actually got out the highchair and babyfood at exactly 6 months of age for my oldest and attempted to do the conventional thing. I was bewildered as to why he wouldn't eat. I worried needlessly over this, but there was nothing I could do to make him eat. With my second child, I saw it coming. I would have been thrilled for them to eat food like other babies, but they would not. It was a very powerful lesson for us in the tremendous quality of human milk. They never had an ear infection and never had anything other than a minor cold. And like I said, they were both very big kids. I was highly impressed by my body after that. I don't mean to belittle anyone, but I thought about hearing women with 3 month old babies, saying that they don't believe they make enough milk to satisfy their babies any longer. I had a huge 1 year old that lived on nothing but my milk. It can be done! And I think it's a variation of normal.
As long as you breastfeed on demand, I wouldn't worry about it at all. I, personally, would stop offering textured food for a while, simply because you might create a negative mental association for the babies wrt textured food. After my youngest gagged to the point of throwing up over a piece of banana I tried to get him to eat, I just stopped all efforts. He outgrew the gagging and he forgot about his aversion so that when he was ready, he was open-minded about it again.