How much medisave to have in cpf for delivering baby?

As long as you have 3k onwards I guess in your medisave that should be enough because if you are under subisidy not much of deduction. Mine was just about 1k plus of deduction, vaginal birth,C class and two days. But I guess it is also good to have sufficient under you and husband account thereafter to choose which account will be deducted later.

If youre under subsidized, theres not much to pay. I think 3k in cpf for either parents should be fine.