Ms Patterson said in hindsight the service had been "half-assed".
"We hadn't anticipated that trying to blend the two different leadership structures [Whanganui and MidCentral] was not easy."
In the future, the Whanganui board is likely to continue to use Palmerston North-based MidCentral District Health Board's maternity services as a back-up under a proposed memorandum of understanding.
From the beginning of May, WDHB was no longer contributing to the Regional Women's Health Services.
The memorandum was recommended during a review of that service, which highlighted several problems including confusion among MidCentral staff around responsibility and accountability, and "differing philosophical perspectives between clinical leaders" resulting in difficulties at leadership level.
The review of Regional Women's Health Services was prompted by the death of five babies at Palmerston North and serious harm to two other infants, one at Whanganui Hospital.
Ms Patterson said the proposed memorandum would be brought to the next Whanganui board meeting on June 17.