Is there anywhere safe to kiss a baby?

My SIL & BIL are a bit intimidating to me, so I wanted to get some information before I asked them what they were comfortable with. My nephew is three months old. I’m dying to kiss his little face, but know I shouldn’t. Is it safe to kiss his hands, or like the top of his head? Can I give him Eskimo kisses, or is that risky too? I don’t want to do anything that could potentially hurt him. Am I being paranoid?