Manuel Montalvo holds his 2-year-old son, Memphis, as he looks in on Ace Montalvo, one of his four newborn sons at The Women's Hospital of Texas on Monday, Feb. 18, 2013, in Houston. Montalvo's wife, Tessa, gave birth to two sets of identical twins on Valentine's Day, born at 31 weeks. The arrival of Ace and Blaine then Cash and Dylan a minute later was even more unusual because the Montalvos did not take fertility drugs or use in-vitro fertilization. (AP Photo/Houston Chronicle, Brett Coomer )

Associated Press
Manuel Montalvo holds his 2-year-old son, Memphis, as he looks in on Ace Montalvo, one of his four newborn sons at The Women's Hospital of Texas on Monday, Feb. 18, 2013, in Houston. Montalvo's wife, Tessa, gave birth to two sets of identical twins on Valentine's Day, born at 31 weeks. The arrival of Ace and Blaine then Cash and Dylan a minute later was even more unusual because the Montalvos did not take fertility drugs or use in-vitro fertilization. (AP Photo/Houston Chronicle, Brett Coomer )
Manuel Montalvo holds his 2-year-old son, Memphis, as he looks in on Ace Montalvo, one of his four newborn sons at The Women's Hospital of Texas on Monday, Feb. 18, 2013, in Houston. Montalvo's wife, Tessa, gave birth to two sets of identical twins on Valentine's Day, born at 31 weeks. The arrival of Ace and Blaine then Cash and Dylan a minute later was even more unusual because the Montalvos did not take fertility drugs or use in-vitro fertilization. (AP Photo/Houston Chronicle, Brett Coomer )
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