Hi I just read your question and don’t worry things are going to be ok. MY grandson was diagnosed with classical pku and we did the same thing had the same questions and worries. As your baby gets older and starts eating baby food, the nutritionist will help you figure out his food. With Chance (my grandson) we will do his blood level and his nutrionist will call and refigure his solid amounts and phenex amounts and we go from there. Our biggest scare was figuring out the phes. but we did it and now its second nature.