How do I tell my MIL to stop kissing and slobbering all over my baby??

This evening I almost said something to my MIL. I love her and  I know she's excited and that her grandson is doing so well but geeze....does she have to kiss and slobber all over him every second. I'm freaking out thinking GERMS!!!  He's still in the NICU. I cringe every time i see her all in his face kissing his cheeks and neck all the time. It's bad enough she smells like cheap perfume and cigarettes, my poor son probably wants to vomit. How do I say something with out offending her? Help please Any sugestions would be greatly appriciated.