"He was so tiny," Cook recalls. "I was a first-time mom. I didn't have a clue. I didn't know what to expect."

It was Oct. 11, 2006. Medical personnel asked Cook, then a 26-year-old single mother, to enroll little Dreshan in a study. She says they described it as a program offering assistance and encouragement to preemies—premature babies—and their families. She readily signed the consent form.

>>> Part 1 of 3: A government-funded experiment put the lives of premature babies at further risk, and some parents say they didn't know.