Vincent started attending the nursery at Maclehose Centre from 1.5 months old to 2 yrs old. I think it's a not bad choice except he's a lit bit vulnerable to illness at the beginning.
Playgroup? Vincent just tried some trial classes of several learning centres, eg. Little Dynamics (in Causeway Bay) or Brain Builder (in Tsuen Wan). The first one is quite far away. I feel exhausted to bring him to there. The second one is so so, I think, ie., a lit bit waste of time. But u can take a try since they provide a free trial lesson.