I have had a home daycare for many years and over that time 5 shelties have been a part of our family. The first 2 grew up with my own children and we never had any problems. Our 3rd was when my own kids were grown and he grew up with daycare kids and was included with all our daycare activities. The 4th pup is a very hyper little girl and until she was around 3 I kept a close eye on her with the kids. She is now wonderful with them. Covers them with kisses when they come in. Our latest pup (he is 2) is another I keep an eye on but I am hoping he will mature also and become more loving with the kids. Our last 2 are not always included with the kids activities because of their hyperactivity so this could have something to do with their behavior. I think if you can keep him exposed to children, probably indirectly at first he will become used to their sudden movements and noise level. Very gradually introduce closer contact and the child should always have lots of treats to give the dog, so it knows the child is a friend. Good luck. 
