I was okay about leaving my DS4, but after reading a couple of posts about this age group, I'm getting nervous. The posts I read talked about them paging you if your child is not participating, i.e. simply playing by himself. This is my child to a tee. He turns 4 in May (we sail in October), and he is VERY shy and prefers to play by himself. He is in preschool 3 days a week and does play well with the other kids, but he prefers to sit and play with his trucks even at preschool. His teachers say he takes about an hour to "warm up" and come hang out with the group. He will do group activities, but it takes some encouraging. He's not one to wander off, but he's not going to dive into something if there are a bunch of kids around. He won't do it even if it is kids he knows. Is this going to be a problem?
I know EXACTLY what you mean!! 
