Month One of Pregnancy first trimester first trimester Months 1-3 are the most critical time for development! three months of pregnancy first trimester three months of pregnancy Month Three of Pregnancy first trimester first trimester first trimester http://www.webmd.com/baby/1to3-months webmd.com first trimester first trimester first trimester http://www.webmd.com/baby/1to3-months first trimester https://www.webmd.com/baby/1to3-months webmd.com http://www.webmd.com/baby/1to3-months#0 the 1st trimester Month Two of Pregnancy first trimester first trimester