In-laws blame me for my baby's disease...

My baby often falls ill. Whether it's fever, flu, cough, or sometimes vomiting... Before having a child, I learned a lot about baby health and how to handle unexpected situations like this. I was quite calm and prepared. But, my mother-in-law who lives with us always blames me. She says my breast milk is bad, of poor quality. She even wants to give my baby honey -- but of course I forbid it! And she blames me. She wants to give my baby coffee because she thinks it can prevent seizures due to fever. I once told my husband about this, but when he reprimanded her, my mother-in-law got angry and said I wasn't a good mother.