Jake Burger will wear No. 21 after being acquired by the Texas Rangers. The number has special significance for his family after his daughter was born in October with Down syndrome. The clinical name for Down syndrome is trisomy 21, a condition in which a person is born with an extra chromosome. Burger credits his wife with the idea of wearing No. 21, and he was working to change his number with Miami before getting traded to Texas in December. He says work is underway to establish a foundation to help other families impacted by Down syndrome.