I have a black lab and he is pretty good with children... exept when they are on the grond. He will go over there and start licking their faces. I don't like that though. I don't think that the little kids would like that. He most likely wouldn't jump on them unless they told him to.

I know a dachshund that is very sweet, you can hold her like a baby. Her name is Shoebox. I think a lot of little kids try to hold little dogs that you can hold, like a baby. The dachshund is a really nice house pet. Well... um, maybe not all dachshunds are nice... maybe it was just that one. Maybe some nip and bark nad maybe even bite. I am not sure.
Pugs are very good with children from what I have saw. I had a pug and little kids loved him. They will sit by you and let you pet him/her. I have just thought that they are very nice dogs. The will sniff and then maybe lick you, they are such a Joy.
My book says that shih tzus are nice. It says: The silky-soft shih tzu wasa favorite of Chinese emperors for centuries. Shih tzu means "lion" in chinese but these dogs, whose weight barely reaches double figures, are sweet tempered and docile.
There are probably more kinds of breeds that are good with children, but maybe you could train them to be nice when they are little... but I am not sure.
Good Luck!