You dont have to worry too much about that, most apartments have a play area for children where they meet friends and hang out with friends. Dont be surprised if everyone pushes their child to make friends with the loawai / waiguo ren (meaning a foreigner) ,being a boy you will hear the words didi (small brother) and gege (brother) alot, they replace the word boy with brother here for children. Most of the grandparents look after the children here. Some schools and Kindergartens have a over a 2 year waiting list , so if you planning to in role him into a kindergarten and school it is best start the process ASAP. If you want him to play with other foreigners ,maybe some else know about play groups but i have never bothered to find any.