Hubbies grandma 😑

My son will be 4 months this month on the 21st. She's telling me that I should give him baby cereal....aren't you supposed to start solids and stuff around 6 months.?? She said he won't choke...I'm not gonna take the chance...she always acts like I am doing everything wrong...Its cold outside and very windy and she says "Oh you don't want to be under that blanket you want to see people" -.- I mean its really cold outside that's why I have the blanket over his carseat...I mean really. I mean I know how to take care of my child 😡 I'm very reasonable with peoples point of view but shit....Figured I'd rant. Anyone else go through this!??!!