How to tell people not to kiss their baby

How do you tell people not to kiss your baby, esp when theyre newborn. Especially for old people who dont take no for an answer and will think we’re being rude. Im planning to not let anyone kiss my baby, be it grandparents, in laws etc, except for me & husband. And do you let guest hold your newborn or pass around? I just want to protect my baby and set boundaries but you know old people 🙄 very hard to explain theyre always right and some would even go against it and just do it #firsttimemom #advicepls