Milk alternative

Just found out, as my son turns 1, that he is intolerant to dairy, oat, coconut... among many many more 😭 I always suspected, but doctors dismissed all of his symptoms. I'm having major mum guilt right now for not pushing and giving him a regular cows milk formula for so long. Doctors won't prescribe him any milk now that he's turning 1, so I'm looking to wean him onto a dairy alternative. Any suggestions that aren't cows, goats, oat, coconut or flaxseed?