What nutrient and/or supplement recommendations would you make for this client?

The parents of a four-year-old boy who has recently been diagnosed with autism spectrum disorder come to you for help. He does not like eating animal proteins and will only eat soft or pureed foods. His diet has primarily consisted of soft bread, peanut butter, and occasionally processed baby food pouches. So far, his parents report that he refuses to eat anything hard or crunchy. They live in a rural area surrounded by farms, the family’s water source is a well, and the mother has received antibiotics many times in her life.

-What nutrient and/or supplement recommendations would you make for this client? Why would these suggestions be beneficial?
-What clinical testing panels would be beneficial for this client and why?
-What other integrative health approaches would be beneficial for this client?