I think it depends on the dog and the household. My family runs in home daycares. My sister has 2 Chi's and I have a yorkie. Amelia is fantastic with kids, all ages. In fact some of the parents have tried to smuggle her out in their diaper bags.
She came into the house as a puppy exposed to kids so I think that had a lot to do with her disposition towards them. She has her own space away from them so she can get a break. But she loves them and they help me by tiring her out. So much energy.