Need pps number but live in northern ireland

I need advice how do i obtain a PPS number if i live in northern ireland.I need it to register the birth of our newborn baby to get a birth certificate,My wife is irish and lives in the south with our newborn.Until i can get a job in the south i have to work and live during the week in the north.
Can a national insurance number be used in place of a PPS number,am sure this happens to lots of parents whos fathers live outside ireland but require names on birth certificates.
Would be grateful for any advice given

Contact Client Identity Services, Dept of Social Protection, Carrick on Shannon, Co Leitrim.

They have an online enquiry form:

https://www.welfare.ie/EN/Secure/Pages/CISGeneralEnquiry.aspx

Here is the general procedure on applying for a PPSN

http://www.welfare.ie/EN/Publications/SW100/Pages/6HowToGetAPPSNo.aspx

you would have got a pps number automatically if your wife was from the republic when you got married

I don,t think i would get a PPS number automatically just because my wife is from ireland!!!!!
Anyway got birth certificate for newborn without PPS NUMBER.just explained i live in northern ireland.