Need hair advice for baby

I have a mixed baby, 11 months old. Her hair is mostly big/loose curls (3a?) but some smaller/tighter curls (3b?) also. I’m not sure how often I should be washing her hair. My husband (4c hair) says that I shouldn’t wash it often (maybe 5-7 days) and that I should moisturize it with Shea butter or coconut oil. I want to wash it a little more often than that and I don’t really prefer the oily feel the moisturizer leaves behind. I have 2c hair and honestly I don’t do much to ‘take care of’ my hair so I’m not sure what I’m supposed to be doing here.

Ultimately I just want to do what’s best for baby girls hair. So... any advice on how often to wash and moisture it?