Hi there and thank you for your question!
This is very normal and a particularly characteristic of children on the autism spectrum. Children on the autism spectrum want sameness and are distressed by unfamiliar food (1). They may also be sensitive to tastes and textures, have a strong gag reflex, and even throw up easily (1).
This can make introducing new foods very challenging, but you are not alone in this! I encourage you to ask your child’s doctor for a referral to see a registered dietitian who is specialized in this area and can provide more guidance around mealtime for you and your child.
I hope this helps!
Anna Ng, RD
Satter, E. "Picky eating: Born or made?" Retrieved from https://www.ellynsatterinstitute.org/family-meals-focus/20-picky-eating-born-or-made/