Mother-in-law speaking in Russian about me when at my house

Ok so my husband is Russian and his entire family and our son speak Russian fluently. When they are at our house they speak in Russian and I really hate it bc I don't understand a word of what they are saying! It is so rude and makes me feel left out. Tonight my husband told me my mil was talking about me in Russian when they came over for Easter telling him that I have gotten too big and I need to eat less all while in my house.. I just had a baby. I'm still breastfeeding. It's really hard to both lose weight and breastfeed at the same time. My husband acted like it was no big deal but I feel it is really rude to talk about someone's weight in their own house while they are sitting right next to you and cannot understand. If she feels my weight seriously needs to be discussed then she should tell me herself...