I took DS1 to gymbaroo and swimming from 6 months to 17 months, then stopped to have DS2.

We have just recently started swimming with both 2 years and 6 months, we go to mothers group once a week and play dates with other friends, but they dont play as such, DS1 tends to do his own thing a lot of the time when at park or play centre with other kids and if anything want to play with big kids.