15 weeks and eating hands

Hi mummies, my baby is currently 15 weeks and loves putting his hands in his mouth. Even when there’s a pacifier inside, he’ll push it out to chew on his fists. Kinda worried that he’ll take in bacteria etc that could be on his hands. We try our best to wipe his hands every time he eats it, and have told the people around us not to hold and kiss his hands as well. What more can I do to ensure that he can continue this behavior in a clean and hygienic manner? #1stimemom #advicepls