Toxic mother

So I have a 6 month old son who is exclusively breastfed or bottle fed breast milk and he is a chunky thriving baby boy hitting all his milestones. Now every time I go to visit my mom she always makes a remark about how much I feed my son. He drinks 4.5 Oz of breastmilk every 2-3 hours which is normal for a breastfed baby she's always trying to make it seem like I'm starving my son but I'm sure if my sons pediatrician was concerned with how much I feed him then she would say something he's also fed 2 meals a day of baby food since he turned 6 months I'm just aggravated at this point because she always has something negative to say she also went as far as feeding him 6oz when I had her watch him and he projectile vomited everywhere I was furious when my sister told me I'm at the point where I want to cut my mother off because she doesn't know how to respect boundaries what do you guys think I should do?