During the press conference, Jack called for a statutory public inquiry.
Meanwhile, Health Secretary James Murray said “no options are off the table” when questioned on the issue in the House of Commons.
Murray, who met families taking part in the maternity review last week, had been addressing Ockenden’s report, which he said contained revelations that were “chilling” and “horrific”.
“I felt numb after hearing the depth of their pain,” he said.
“I felt even more numb when I considered how many families not in the room went through such trauma too, and the forgotten children who survived but lived with the consequences of failings in maternity care every day.”
Murray, who said he would be speaking to NUH chief executive Anthony May next week, added the “government will act”.
In a statement, the Nottingham Maternity Families Group said: “It feels like there is no aspect of maternity and neonatal services that has come out of this review unscathed.
“Some of the themes identified in the report are ones that we, the campaign families, have direct and personal experience of. Our concerns were dismissed and not acted upon; we weren’t told the truth about what happened; even after death babies were treated with an absence of dignity and NUH frequently failed to keep our loved ones safe.
“The report findings and actions that Donna and her team say must happen, must be treated with the utmost seriousness and implemented in full. Anything less would be a betrayal of the families whose suffering has made this review necessary.”