My son who is one year today (yipee) has pku. I tried the special needs board but it doesn't seem like the right fit. If you don't know what PKU is phenylketonuria..basically my son will eat a low protein and vegan diet for the rest of his life. He takes a medical formula he will drink for the rest of his life. He can't ingest more than 150 mg of protein a day, yes less than 1 gram. I'm very limited in the foods he can eat. No milk, soy, animal products of any kind, no nuts, gluten or flour and especially no artificial sweeteners. He gets blood drawn once a week since he was 2 weeks to track his levels. Although this isn't an "allergy" his levels not being in the correct range would result in irreversible brain damage that would lead to mental retardation. There aren't a lot of PKU resources since it's a rare disorder. Hopefully I can chat with some of you mamas. Oh by the way I'm also pregnant with another boy..due at the end of this month...:-)
Re: pku
My almost 2 yr old niece and nephew have PKU - and looking at your location, it's possible they are the same people that you know, because they live in the Twin Cities
She wrote a great post on her (very very rarely updated) blog about it here: https://bejogram.com/2012/01/31/so-you-wanna-know-more-about-pku/
You may have already seen these, but here are some great websites with a ton of resources: https://www.pku.com/
https://www.cookforlove.org/
Most states have PKU foundations - I know MN has a fairly active one and their website might have links to other states as well: https://www.mnpku.org/