What blessings....?
Just tell them straight and to the point that you married your husband for love, and not to keep them in luxuries.
You are having a baby, have no job, you don't want to put your husband in a spot.... this is all pressure that you don't need.
When baby is old enough, and you get a job, you "may" be able to contribute a little, but they have to understand that your small family comes first.
Obviously in case of a real emergency, I don't see a reason for not helping.