http://www.helium.com/knowledge/173490-the-development-of-a-baby-during-the-first-trimester-of-pregnancy.xml Helium.com > Pregnancy > The development of a baby during the first trimester of pregnancy en-us Copyright Helium.com Mon, 30 Jun 2008 17:37:10 GMT Mon, 30 Jun 2008 17:37:10 GMT