MIL help!!

Nevada
So I'm pregnant with my first and my husbands mom thinks she knows what is best for me and my baby. She isn't from America. She's Cuban and very set in her ways. I'm a vegetarian and she says I HAVE to eat meat. She says when the baby is only 4 MONTHS OLD I HAVE TO GIVE IT BLENDED UP MEAT (like baby food). I am so furious! You can't give meat or anything besides milk to a baby that young!! She's says it's perfectly fine because she did it with both of her children. And now my husband thinks it's okay to give him blended meat at that young. It is MY CHILD! I can make the decisions that I think and know are best for MY CHILD. And I'm scared that if I ever leave her to babysit she will give it things that I don't approve. Ugh! I don't even have the baby yet and I am already so stressed and angry! Am I wrong? I need some advice!!