My 12-year-old sun suffers from exczema. Is there always milk and wheat in baby food?

Question confusing. You talk about a 12 year old & then ? About baby food. The ingredients of commercial food products will be listed on the label. Anyone concerned about food allergies should develop the habit of inspecting the printed labels prior to purchase. Many of the national brands will also post ingredients on their website information page. Generally, stage 1 foods are the least likely to contain any fillers.