From the "Pregnancy Calendar"

Your baby's testes or ovaries have developed, though the sex probably won't be visible on a sonogram for at least another month. Intestines have developed at the place where the umbilical cord meets your baby's body. The intestines are able to make constricting movements, though there won't be anything to digest until later.

Reprinted with permission from Great Expectations: Your All-in-One Resource for Pregnancy & Childbirth. Copyright 2004 by Sandy Jones, MA and Marcie Jones, MA. Used with permission from Barnes & Noble Books, an imprint of Barnes & Noble Publishing, Inc.
http://parenting.ivillage.com/pregnancy/calendar/frame/0,,,00.html?downDate=2005-10-25