The scars of childbirth were still healing on Amelia Reyes Jimenez's stomach in 2008 when police came to her Phoenix apartment and took her three-month-old daughter from her arms.

Three and a half years later, Reyes Jimenez and her four children have become statistics in the U.S. crackdown on illegal immigration. Each year thousands of children of undocumented immigrants, like Amelia's kids, wind up in foster care when their parents are arrested for immigration violations. Some are even adopted by U.S. citizens while their parents are held in federal detention centers or deported back to their native countries.

Reyes Jimenez's son and three daughters are now living in foster care in Phoenix, and are awaiting possible adoption. Reyes Jimenez is back in Mexico, her parental rights terminated by an Arizona judge, and she cries when she remembers the raid that began it all.

"My daughters were calling, 'Mommy, my Mommy,'" said Reyes Jimenez. "I felt destroyed. I felt like I would never see my girls, even worse [the baby] was so small. I had just bought her cradle and her stroller."

WATCH: ABC News' Interview With Amelia