fetal-development

Pregnancy Week by Week: Complete Trimester Guide and Fetal Development

Pregnancy Week by Week: Complete Trimester Guide Every week of pregnancy brings new developments. From a cluster of cells smaller than a poppy seed to a fully-formed baby ready for the world, the transformation is nothing short of miraculous. Quick orientation: Pregnancy lasts 40 weeks and is divided into three trimesters. The first trimester (weeks 1-13) is when all major organs form. The second trimester (weeks 14-27) is when baby grows rapidly and you start feeling movement. The third trimester (weeks 28-40) is when baby gains weight and prepares for birth. During my own pregnancy, I obsessively checked what was happening each week -- I first felt flutters at week 19, had my anatomy scan at week 20 (everything looked perfect), and started kick counts religiously at week 28 after my OB recommended it. My daughter arrived at 40 weeks and 3 days, and looking back, the week-by-week tracking helped...