"Midwives in Northern Ireland are staging a four-hour strike action on Thursday in a dispute over pay.
They are calling for a 1% pay increase, as was given to their colleagues in Wales, Scotland and England.
The industrial action is being held between 08:00 BST and 12:00 BST.
It is the first time members of the Royal College of Midwives have staged a strike in their 134-year history.
The Department of Health said officials were working to ensure a safe service was provided during the stoppage."