Sophia started to attend pre-nursery class right after 2 year old. To our surprise, she cried only in the first few days. In fact, she likes going school and is happy to get in the school bus.
We had interviewed a few kindergartens and joined their playgroup. There are some differences between these kindergartens. Parents have to choose based on own requirements such as distance from home, quality of teachers, curriculum, teaching approach, fee level, facilities and medium of instruction.
Have a look at the profile of kindergartens (http://chsc.edb.hkedcity.net/kindergarten/), it's interesting to find the salary range of teaching staffs of some private kindergartens is lower than that of non-profit-making kindergartens. Of course, the qualification of teaching staff in some 'famous' private kindergarten seems better than normal.
Some kindergartens are better managed. You can feel the teachers are enthusiastic, the principal can point out the school characteristics.
I ordered an interesting label product "ċċçıċ" to label her school uniform. The labels come with heat seal at the back. To fix the label to clothes, simply iron the label on cloth.