Baby has frizzy hair, what to do?

My girl has super frizzy hair, was wondering what you guys use for your babies hair, she is 18 months. It looks like i dont brush it but i do, right now we use aveeno on her since it helps with her skin but as soon as her hair dries after baths it goes back to being super frizzy in the back. my dad has super curly hair and i have wavy, do you possibly think its frizzy because her hair is wavy and i’m not using the right products for her?