worried about 3yr old?

He is probably fine. He's adjusting to school and all the activity. It's not uncommon for a child to be completely exhausted after school! If the preschool/nursery teachers say that he's doing well there, he's probably just exhibiting "quiet child" symptoms at home because he's too tired and using all his energy at school. He's also just found out he's getting another baby in the house and that could have him a little bit thrown--he is young enough he doesn't quite remember getting a baby brother, but he knows that the baby brother takes a lot of attention. I think he'll be fine, he's just still adjusting to all the changes and excitement!

If for some reason things don't settle down or he seems like there is actually something wrong, talk to his pediatrician. But for right now it just sounds like he's in the adjustment period.

it could be all the change he's experiencing- going into daycare and having a little sister on the way.. He could be worrying that you're shipping him off to day care because you're having a new baby? I've seen it happen during my time working at a nursery. Try spending extra time with him, and talking to him about his new little sister, reassure him he'll still be as special and as loved, and get him involved in the arrival preparations, such as picking her out an outfit or a few toys.. And see if that has any change on his behaviour? I think it'd be a process of elimination, he could just be over tired from nursery but the news of a new sibling arriving, specially one of the opposite sex, often is the cause for a behaviour change. Good luck :)

He's just got more activity at the preschool than at home (all those kids etc....). He's just going to take awhile to adjust.

I think with the new schedule and being really active in school his body is just trying to adjust. It's kind of like jet lag but for toddlers that are in preschool. Give him time. Let him rest.

its perfectly normal. Don't worry.

IT is normal...

I think maybe he feels like you want to get rid of him by sending him away for so long. Maybe skip the pre school. It's not necessary. Poor baby