old wives tale.
the baby still has mothers immunity especially if he's drinking mothers milk..google if you don't believe me.
as long as you've washed your hands and don't sneeze in his face, you're fine.
it's better for him to be exposed..please do not turn your the kid into milquetoast jewish child..my daughter had to teach her husband how to ride a bike. this kid lived in sofla (all our beautiful days with friends) all his life and his mommy wouldn't let him ride a bike as a child or teen because he *might get hurt

..i'm surprised they let him get a drivers license.