Kissing my child

Okay so first off, I've seen a lot of these posts and every time I see one it just makes my mind go crazy!

My baby will be due in early October, when sickness really starts setting in. I do NOT want people kissing my child. My SO and I will not even be kissing him for health and safety reasons. Babies have very little to no immune systems and thus I don't want to risk him falling ill as I've heard many many horror stories.

The biggest problem lies with my MIL. She always has something to say regarding my son in terms of things SHE'LL be doing. For example she is always telling me how she'll be feeding my child solid foods at two months because she did it with her children and they turned out fine (um.. NO). She acts like she has some sort of claim on my child and it's frustrating. Anyways I know for a FACT that she will be trying to kiss my son and I do not want that happening. She gets very offended over things that don't have anything to do with her (ex. I just purchased a pack n play with a bassinet for my baby when he's born since he's coming soon and she got angry and yelled at me because she offered an old one from her first child but I chose to go brand new for safety reasons). All in all she is quite selfish in many respects and I am nervous about leaving him with her because I know she will likely just do what she wants while I'm not around.

So my question here is how can I politely but firmly tell everyone (ESPECIALLY MIL) not to kiss my baby when he's born?

*Side note: my SO and I are living with his family for a short time until he's off in the military since we'll just have to move anyways so my MIL is going to be around everyday.

*EDIT: I also think it's extremely important to remember that even though a child or adult may not show any signs or symptoms of illness, it is still VERY possible for them to have an illness that can be passed on to others. Newborns are especially prone to catching something! This fact alone is enough for me to keep any and all kissing to a zero. Why risk it when there's something so simple that can be done to help prevent illness? 🤷‍♀️

My child's health and safety is ALWAYS going to come before any and all family member demands. My SO and I will make the decisions and if some people aren't okay with that then that will be their issue to deal with. The advice in this thread has been especially helpful in making me want to stand strong for my son. (I'm very passive and always get walked over)

Lastly I just wanted to thank everyone who commented and supported my decision with sound advice!!! 💙 It makes me feel worlds better knowing that there are so many other mothers out there like me who've made the same choices!