MIL ISSUES! Help!!!

My lil man is 18days today and yesterday he had fever. We went to hospital and was under observation for 4 hours. All good, little man is doing great. We’re home after that & he’s absolutely fine.

Issue is now my MIL is restricting me for everything, she’s showing like I’m doing everything wrong and he got fever because of my ignorance.

She is saying from today I’m going to bath him, massage him. Put him more clothes. I’ll takecare of him. You only eat that stuff which I’ll give you.

I’m really fed up and I don’t want to be rude.

Please help ladies, how do you deal with this kind of unwanted comments & unwanted help.