Advice please girls

Ok. Here goes. My husband left me when our baby was 4 months old. She’s now 5 months old and things are horrible.

Anyway, he wants her to stay with him for 3 nights a week. I’m trying to be as reasonable as I can however I truly feel 3 nights is way too much for a young baby. In fact I think an over night at this age isn’t fair on her.

I’m allowing him 2 days a week 9am-5pm

Is this unreasonable? I still breast fed morning and nighttime which she enjoys but he thinks I should give that up.

Please anyone x