MIL problems.. 😡

My soon to be mil has been really irritating me the past few days. She always has a opinion on the subject of my baby and where should me and my fiancé should live. She doesn't like the name we have chosen for our son and she has the idea that our baby won't be able to fit into anything newborn. I understand that this is her first grandchild but this is also my first baby and I'm just trying to enjoy it but she is making very difficult.