No kissing the baby

Hi, I’m currently 18 weeks pregnant but I’m just wondering how do you tell your partners family not to kiss the baby (once it’s here). There are currently 2 other babies/toddlers on his side of the family and everyone especially the grandma and women are very affectionate and I do see them kiss the baby. I don’t want to be rude, I just don’t want anyone kissing my baby. They are very old school and don’t really understand a lot of the new “rules”. For example they’re very firm on me not getting an epidural, even though it’s clearly my choice and girrll if I want it ima get it 💁‍♀️. Idk I’m just getting very antsy about telling them not to be kissing all over my baby which is something they would do normally.