L., my son is 3 and is just now really starting to play a little bit with others - for the most part up till now he really more like played "alongside" others...mostly when we have his friends over now, he plays with his toys like always but he talks to his friends and shows them "how" to play with his toys. the main thing at this age is to make sure he knows how to share, and how to treat his friends. i would not stress about him making friends - being in a daycare setting is great for that. some kids/people are just more outgoing than others. as a very shy/quiet person raising a son that's turning out to be, just because he isn't surrounded by friends doesn't necessarily mean he's unhappy, either. it's probably good that the teachers don't show him as much singular attention, it will encourage him to make friends on his own. a conversation is always a great way to teach and i think that talking to him about how we treat people, and what a friend does, is a great idea. good luck, he's still so little i am sure he will adjust great.