Time outs are not appropriate for a child under 3 and generally are not a good idea at all as they promote detachment rather than attachment. Hitting is pretty normal for his age. he doesn't mean harm by it. The advice from most child development experts is to keep on and on telling him no and to model gentle behavior. Take him away from his hitting object and divert him to other things. It can take quite a long time for this behavior to go away. Children at that age don't have great memories and so you have to do the same thing over and over and over and over for them to eventually learn to do something other than what they were wanting to do. They have virtually no impulse control and so even if they know you don't like something, they will generally do it because they basically can't quite help themselves. Just as you are heading into daycare, you may want to talk to him about not hitting and then the teacher has to keep telling him and removing him when he does hit. Good luck.