Oh and LuckyCrane - to make the process easier, try to find some documentation that lists your ethnicity on it, and bring that along to the birth cert registration. Also before you accept it, make sure that the birth cert says "established" down the bottom.
Also, the process is smoother if you look Chinese and talk to them in Chinese - sometimes they don't even bother asking for "proof" of ethnicity in that situation. That happened when my husband applied for my eldest daughter's birth cert - he didn't bring any proof and wasn't hoping for her to have right of abode, but since he was obviously Chinese, he was told that we didn't have a choice, they HAVE to have right of abode. When I went to get my 2nd daughter's birth cert, I'm white and talked to them in English and I had to really fight them to get her right of abode since I didn't have the proper documentation (with exactly the same documents that we brought first time around). They eventually gave her right of abode, based on my 1st daughter's birth cert.