Kissing baby

My baby is 2 months 9 weeks today n i have little brothers n sisters. Im 17 so theyre young still theyre 10 n 8 n they like to kiss her alot on the cheek n stuff it annoys me bc i know of a baby that died because of that i saw a post about it. I told them not to n told them what happened to that baby but they keep doing it. So annoying.