Congratulations on new son.

It sounds as if your mom is a lovely woman; personally, I know how hard it is saying no to your older children, and hopefully, she’s learning from you as you work through these boundary issues as well. The most important thing is that you have to be a bit selfish for yourself and your own health and well being right now. It’s going to be harder with your hormones being a bit out of whack as they tend to be during pregnancy, but the bottom line is that you need to do what you feel is best for you and your marriage and that growing little baby. Stress is the last thing you need right now, so address whatever matters need to be addressed, but do it in a kind and a gracious manner, and then stick to your guns (yeah, I know, easier said than done).