Your solicitor is correct. Leaving an abusive relationship when there is a child involved normally does not mean that the abuser can be completely cut off.
He has parental responsibility so he has the right to know about and be consulted on important decisions in your child’s life.
There is also the issue of contact. If you can not agree contact arrangements then he can apply to court for a contact order. What order is made depends on your circumstances. Lots of women have 50/50 but there are also cases with much less contact, or with contact being supervised at least initially. There can be arrangements for handovers at neutral venues or by third parties. Your solicitor would have to advise you on what contact is appropriate/ would be likely to be ordered in your particular circumstances.
There are lots of ladies on this forum who have to navigate ongoing contact arrangements and shared parental responsibility. It can be very difficult.
It is good that you have a solicitor. Ask them any questions about what is likely to happen with your child as they know your case. Good luck.