My son will be 2 months old this January and I wanted to go to the Mommy and Baby class at my yoga studio. The class description says for babies 6 weeks to the age of crawling, but being winter and he being less than 3 months I worry he could be exposed to a cold too early. Considering its a class of mom's like me, protecting their newborns from illness, I think it should be fine, but what do you think?