Acknowledgement of paternity

Hi! Ask ko lang po sana kung paano process ng acknowledgement of paternity? I’m giving birth this July po kasi and my partner which hindi kami kasal is nasa US. Balak ko po sana ipaapilyedo yung bata. Sabi kasi sa embassy after birth daw makakakuha ng certificate of acknowledgement of paternity. Is it considered late registration na ba pag ganun or pwedeng to follow yung certificate?

Help po pls