If you have children and a pool, childproofing your pool is very important, but one family learned that the hard way. Carin Richardson -- a 12-year-old girl with Down syndrome from Michigan -- saved her 3-year-old sister's life this past Tuesday.While the family started to head inside from the pool, Carin decided to walk back outside so she could stay and swim for a little longer. When she walked back outside, she found her little sister Jac'Lynn struggling and nearly drowning in the pool."Without panic or fear, Carin grabbed her goggles, got in the water and pulled her sister out of the pool and into the house," Tomarra Richardson -- the girls' mom -- said.Tomarra called Carin a hero and she said that Jac'Lynn is the family's "little miracle baby."