MIL vent

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She just got here yesterday and I love her but I'm already so annoyed 😩 she keeps telling me what not to eat because she thinks my baby has heartburn but he is fine, I know he is. I am the mother.. and that my pain on my left breast is normal. It is not normal because it freaking burns and it hasn't burned like that before and she says you've never had a baby before and I said no but these past 5 weeks that he has been here I've breastfed and it never burns like this. I am trying so hard to work nice and hold in my frustration I hope I can keep being nice these next 9 days she is here 😩😩😳😥 
How do you girls handle MIL comments? I've been so lucky all of our family lives in a different state except for my parents that never get in our business