Most shepherd breeds have the same problem with children in any case. They behave better with supervision. Fortunately both children and this dogs share a endless energy and love for mischievings, so after some surveilled contact they infatuate with the other really fast (and then you have a...
Border collies are not always great with children but it depends a lot on the individual psychology of the animal. They need a lot of exercise both, physical and mental. If they do not receive it, can turn bored and start to treat the children as their personal flock, and flock for a shepherd...