The Rotunda Maternity Hospital says a low vaccine uptake among pregnant women is partly the reason for maintaining restrictions around partner visits.
In a recent survey of inpatients, the hospital found that 60 percent of patients and their partners are not fully vaccinated.
In a statement, the hospital highlighted that the building is 275 years old and says maintaining a 1 metre physical distance is not possible.
Former master of Holles Street national maternity hospital Peter Boylan says he can understand the hospital's position.
He noted hospital expects to have 9,000 births this year and says the problem lies in "basic overcrowding".
But for some pregnant women, the restrictions appear unfair.
Sue Murphy, who is 30 weeks pregnant and attends the Rotunda, says women "have to have their partners" by their side.
"There is nobody there to advocate on your behalf when you're after an operation or delirious after giving birth".
Sue's husband, along with many others, has been forced to wait in car parks while she is seen in hospital.
"That is completely unfair," she said.