I agree with Momof4...the home envorinment makes a huge difference! My own two youngest children are 2 and 4 and they share everything. I mean, literally I purposely give them one bowl of grapes or one plate with sandwiches on it and they share happily because we have cultivated that in them. When one gets a new toy for his/her birthday he/she is expected to give turns to the other one as well and there is very little "mine" in our house because we do not allow that attitude to thrive here. Now with the dck's it is much more difficult because at home most kids nowadays are taught that the new toy is only for them and they do NOt need to share it. Parents teach the "mine" attitude a lot and reinforce it by buying two of everything so that siblings never have to share, God forbid. In the daycare, I just keep plugging away at it and also ask parents to try to play turn taking games with their toddlers, which helps a lot. I also lavish praise on good turn taking or sharing whenever it happens, especially if it was voluntary. My 2 year old daughter is the biggest turn taker and sharer I know and when I praise her for being a nice friend and giving things to the other kids, I see that they want to do it too Positive reinforcement is really important. At the ages of the kids desribed above I really don't think you can leave them to work it out themselves though...toddlers don't have the social skills to do that without it leading to mass chaos and fighting and someone likely getting hurt. I think we relaly have to teach them how to behave appropriately and it takes time!