Young moms

How do you deal with the snide and passive aggressive remarks about how you should've waited or don't you want to live a little before having a baby?? Or why didn't you have an abortion?? 
I know I shouldn't let it bother me but I can't help it. I can't even think of a good come back. Like my baby is the greatest thing to ever happen to me you don't have to love her but I do so fuck you lol