But nursery/childminder might have little babies too. Most take them from 6 weeks. Or if they go to a childminder, they might in turn then go to baby group with that childminder.
I am inclined to say carry on with normal life as long as no temperature and obviously not flu, whooping cough, pneumonia, chicken pox, measles, mumps, impetigo, scarlet fever, D&V.