The midwife-led unit at Altnagelvin Hospital has been unable to open since the Covid-19 pandemic.
A shortage of midwives has been blamed for the unit in Derry not being able to re-open and it remains unclear how long it will remain shut.
The Western Health and Social Care Trust told BBC News NI that "attempts are being made to address the issue".
The Trust also said that there is "a shortage of midwives regionally" and that it "has increased the number of midwives in training in an attempt to improve the recruitment of staff".
Women are still able to receive midwife-led services at Altnagelvin in the delivery suite and also for the antenatal and postnatal period.
It also comes amid an ongoing review into the effect of the closure of maternity services at the Causeway Hospital, which came into effect in July.
Karen Murray, director of the Royal College of Midwives in Northern Ireland, said "recruitment issues at Altnagelvin are not new and they are aware of the acute problem".
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"Fifty midwives left Altnagelvin Hospital alone in the past few years because of retirement or taking other career paths," she said.
"The Western Trust is aware and have been working on recruitment.
"In fact, about 15 newly-qualified midwives will hopefully be able to alleviate the problems in the next year.
"It's important to say though that expectant mothers and new mothers are being cared for and looked after still, we just need the doors open to the unit."
Ms Murray added that while there are currently 65 midwifery students at Queen's University Belfast, "we'd rather see that figure at 80".
