✔ 最佳答案
1. You need a lawyer, as well as the father's approval.
A birth certificate, unless contains error, is permanent record that can't be changed.
So the only way to change the name is to use a name change deed by a lawyer.
For the cost and time, you will have to contact a lawyer.
2. No and Yes.
No - you are not required to do so as it is still valid (the name change deed will cover the new and old name. It does not void the old name at all).
Yes - it is for a better convenience.
2013-07-20 04:24:28 補充:
1. There is only 1 Immigration Department. So if the Department asked you to ask a lawyer, find a lawyer. In your case, find another one.
2. Even without custody, the father is still a legal guardian for the baby (when necessary). So without his consent, you may end up with a big issue.