Mixed baby hair care help!?!

Abby

My baby is half white half black he’s almost 3 and I’m trying to find a natural deep conditioner I was gunna use mayo but I have to heat up conditioners , oils, or hair mask because his hair doesn’t absorb it as good when it’s not hot now. I know u can’t just heat up mayo so I’m kinda at a lost cuz I want a deep conditioner but one without protien cuz I do protien treatments when I wash his hair witch is every week ( go any longer his hair starts to look weighed down )

His hair is corse and dry but on top curly but my texture and just needs a lil bit of product