(CNN) There's a baby boom in an Arizona hospital and it's not coming from the maternity ward.

Sixteen nurses who work in the intensive care unit of the Banner Desert Medical Center in Mesa are pregnant.

"I know a couple of us did fertility treatments," nurse Paige Packard said at a news conference Friday.

"That's how I ended up finding out that everyone was pregnant. I was like, 'Oh, well, I didn't plan this. Did we have some kind of pact going I didn't know about?'" Packard said.

One of the pregnant nurses at Banner Desert Medical Center holds a onesie given to her by the hospital.

There was no pact. The baby fever is just a happy coincidence.

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