Kateri and Jay Schwandt hold their new baby boy at...

Kateri and Jay Schwandt hold their new baby boy at Mercy Health Saint Mary's Campus in Grand Rapids, Mich., Thursday, May 14, 2015. Credit: AP / Cory Morse

A Michigan man whose 13th son was just born says he's convinced that "medically, it's just not possible" for him and his wife to produce a daughter.

He also says it's proving a challenge to agree on a name for their newborn.

Forty-year-old Jay Schwandt tells The Grand Rapids Press the boy born Wednesday is the second he and wife Kateri have had who arrived with a full head of hair.

The baby and 40-year-old mother are doing well at Mercy Health Saint Mary's Hospital in Grand Rapids. He's 22 inches and weighs 8 pounds, 9 ounces.

The father determines a child's sex. Newcastle University researcher Corry Gellatly's 2008 study says four centuries of genealogical information shows some men may be genetically prone to having more sons or daughters.

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