updated 10/5/2007 9:42:47 AM ET 2007-10-05T13:42:47

It won't take much for Jenna and William Cotton to remember the birthday of the newest member of their family.

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Daughter Kayla was born Tuesday, which was Oct. 2 — the same date her brothers were born.

Ayden Cotton arrived on Oct. 2, 2003; Logan was born Oct. 2, 2006.

The parents said they had a feeling their baby daughter might come a couple of days past her Sept. 30 due date. Sure enough, Jenna Cotton, 23, began having contractions early Tuesday, hours before a planned birthday party for the boys.

She had a doctor's appointment scheduled later in the day and hung in for the party. Ayden, the 4-year-old, wanted to know if his new baby sister would make the festivities, Jenna Cotton said.

Kayla, at 7-pounds, 8-ounces, was born at 7:07 p.m. Tuesday.

The odds of a family having three children born on the same date in different years are about 7.5 in 1 million, said Bill Notz, a statistics professor at Ohio State University.

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