Once they're out of the diaper and carting-the-whole-house-everywhere-you-go phase, it's easy to see how parents can call it quits when it comes to having more children. But sometimes holding an infant or sorting through boxes of baby clothes makes them rethink their decision. Heidi Klum recently told Redbook in its July 2008 issue that she and Seal haven't reached that point. She said:

"So many people say, 'I am so done.' That hasn't come out of my mouth, and it hasn't come out of Seal's mouth either," the Project Runway host, 35, tells Redbook. "I feel like we still have one coming."

The couple has three children — Leni, 4, Henry, 2, and Johan, 1— which means another baby would make an even four. When did you know you were done having kids?