How to apply for "children born to Hong Kong permanent residents in the Mainland to settle in Hong Kong"?

If the child is born in the Mainland, the father's name on the birth certificate is not the biological father, and the child is born out of wedlock, it is very difficult and complicated to apply for immigration to Hong Kong.

First of all, we should go to an officially recognized medical institution in Hong Kong for paternity test to prove the blood relationship between the child and the biological father. Secondly, because the child is born out of wedlock, it is necessary for the parents of the child to have an agreement on the custody and custody of the child (including the legal father stated in the birth certificate), and this agreement needs to be notarized by a notary office officially recognized by Hong Kong and the Mainland; The remaining procedures are the same as those for the immigration of children born in marriage. Bring the original and photocopy of the above two documents, the child's household registration book in the mainland, birth certificate and other documents to the exit-entry management office of the local public security bureau to apply.