I personally use Childs Farm, they have a great range (vegan friendly and cruelty free) that smells fantastic. It says it is made from 97% natural ingredients. My LO hair is thick and curly and it works well with her hair. Another great option is Shea Moisture but it is on the expensive side. They also have a range of products that can be tailored to your LO’s hair needs.
The other month I bought aunt Jacky Curly babe, it's a big pink tub, not cheap at 7.99 but it's just ok a lot of the products say natural but when you read the label they contain a lot of things you can't pronounce. I guess something completely natural would be like a nice Jamaican castor oil, not the heavy one but you can get the nice smelling ones that have a mixture like mango etc in the hair shops the hair comes out nice with a small brush when you want to do bunches and sides etc
You can try cantu , they’ve good leave in conditionals