Advice needed

I’m considering leaving my husband. We have a 16 month old baby who I breastfeed. I would want her to live with me. The father could have full access and have her whilst I’m at work and time with her on request. He would want a 50/50 split. What are my chances?

If it went to court I worry he could try to use my mental and physical health against me (much of which he caused). I have supportive family in this country and he does not.