We got a staffie cross about 7 months ago and she is great with the kids. When she has had enough she goes to her bed for some time away from the kids.
We also adopted a Jack Russell x from the pound and he is also pretty good with the kids.
The kids adore both dogs and they're both small enough to be inside. Our Staffie is a gentle lazy dog and the Jack Russell is playful and loves playing with the kids.