I have the same problem. It’s so curly after I take hjm a bath and it stays curly until he ends up taking a nap the curls go away and his hair gets wavy 😕
Just going to add, my son was the same way when he was younger. Curly hair after bath, but straight when it would dry. It eventually changed as he grew, and now has tight curls.
Coconut oil works pretty good. But I use something cAlled "hair pudding" you can get it at any Solon, or even Walmart has it. It works really really well. I tried everything under the sun till a Jamaican lady suggested this, and it's awesome.