Nearly 300 babies were born in Northern Ireland last year to mothers with an address in the Republic.
Figures obtained by Nuacht from the five Health Trusts in Northern Ireland show that the majority of these births were in hospitals near the border.
In the Southern Trust Area, 197 babies were born in the Daisy Hill Hospital in Newry, Co Down, and 13 in Craigavon Area Hospital in Co Armagh to mothers with an address south of the border.
In the Western Trust Area, including Altnagelvin Hospital in Derry and the Erne Hospital in Enniskillen, Co Fermanagh, the figure was 83.
According to the health trusts, some mothers cross the border to give birth because geographically the hospitals are closer to them, but many also say they receive better care.