His children have been effectively banned from their home simply because the father has had yet another child. Families all over the world grow and expand and all manage to adapt and adjust without a lot of drama.
It can be difficult to have a high risk pregnancy . Both my pregnancies were high risk ,and I had 2 miscarriages between the 2 successful births. So, I fully understand the issues that come with high risk pregnancies. However, we did not ban my daughter from her home at any point during or after my pregnancy with her brother.
My ex is a physician and he had started a new practice and could not take time off to stay home with us. My mom came to stay for a week after the birth to help out and we had a regular cleaning service to clean the house.
OP , tbh your husband's ex is concerned with her children's ongoing relationship with their father and less so about your pregnancy status 3 weeks post delivery.
Paternity leave was established to allow father's time to adjust to the new arrival , that adjustment involves fitting the new arrival into the existing family structure. It seems as though you have both forgotten that his existing family structure consists not of 1 but 3 children.
Normal living rarely gives us the opportunity to put aside existing responsibilities simply because we add on new responsibilities. In the real world , we just adjust and juggle all of our responsibilities . These children are not your responsibility , but they are your husband: s ongoing responsibility, and he seems to have forgotten that he now has the same obligation times three.
Congratulations on your new arrival. No matter how difficult it may seem at the moment, keep in mind that pregnancy and post pregnancy adjustments are made all over the world on a daily basis.
You will adjust, and your baby will thrive as part of a large new family.