Starting my son on Gluten Free and Casein free diet

Be very careful putting a new baby on a diet like this. Are you doing this under doctor discretion? The nutrients in gluten foods are important for growth and you need to make sure your son is getting those nutrients if you take them out of his food. If you haven't already, seek your peditrecian or nutritionist for babies to help you on this. If you are only doing this because he is not talking, my advice is don't. Babies grow and develop at different ages and times and he is so young. Many children can go years without speaking a word and it is not due to gluten.