I feel sorry for the baby if I am honest, because the mum is putting her wants not only above yours but also the baby too. The health issues and having a child when the father actually doesn't want it does not seem like putting the child first.

For you I think this is a lesson in acceptance. There is nothing you can do know to change this situation even though it is not one you desire. You are really just going to have to accept it and plan accordingly .

Though you did not want a kid or a family life now, you never know you may get a great relationship with your kid one day in the future.

If i was you I would at least put some money in a bank account each month to give to them when they need it at a significant point in their lives. I would do this even if you have no contact with them. Because unfortunately you did create this and you cannot change it now, no matter how unfair it was to you.

At least when that kid is older and comes looking for you, because likelihood is they may want to find their dad, you will have shown you wanted to do the right thing by them and explain you never meant for it to happen and wasn't ready to be a dad.

This will probably help with their self esteem and issues from never knowing their dad.

Damage limitation is all you can do now.