L.M.
Hi,
Every kid is diferent.. I had a similar experience when my daughter was almost 3 starting preschool full time.. I had another baby on the way at the time.. A good sign is that he is happy when you pick him up.. I think it is good for kids to have an outing and meet other kids.. Does he cry a long time after you leave or is this something he does just for you? My child wouldn't get dressed in the morning ect.. but as soon as I droped her off and was out of sight she stoped crying and was happy.. I even hid in the hallway one day to check.. Also for me the longer I stayed at drop off in the morning the more she made a scene. When she reached a little over three things changed for the better she was getting dressed in the morning and happy to be droped off at preschool.. It was nice then b/c preschool set a routine for our household with bed times ect.. and she became a much better listner and picks up daily.. This is my experice I had and every kid is different but after 3 weeks or so she realized that I was not going to stay b/c of her morning fit.. The preschool assured me they would call me if needed. I know it is hard but I think it will get easier and I am glad he is happy when you pick him up and it is a good sign he is excited with his work :) Also, ask the teachers their opinion on how your child is doing and let them know you are concerned and see if they have any sugestions.
Good luck,
Lenc