Toddler kissed my 3 day old baby!

A.

So my neighbor has been wanting to come over since we came home but i had a c section and i have so much pain so I’m not up for visitors. My husbands friend came over to drop off his pre-workout and accidentally went to their house and they followed him over and invited themselves in. In the end my neighbors daughter who is 3 years old freakin kissed my baby in the mouth. I’m worried freaking out after seeing scary posts on fb about stuff like this. Has this happened to anyone? What did you do?