Tammy Bitting gave birth to her daughter, Tanya, Sept. 30 at Underwood Memorial Hospital in Woodbury, and sisters Carol Newman and Kim Slowey followed with their own babies, Anna and Kyleigh respectively, Nov. 20, the Washington Township (N.J.) Times reported Thursday.
"We made jokes about [delivering on the same day]," Slowey said.
The sisters said the baby boom was a boon to their own mother Janet Slowey, whose total number of grandchildren has now reached six.
"She kept saying she wanted more grandkids," Bitting said. "Now she's got them."