6 Week Old Fetus. Week 11 of Pregnancy €" Pregnancy Signs and Symptoms 6 week old fetus, 6 week old fetus size, 6 week old fetus ultrasound, 6 week old fetus size comparison, 6 week old fetus development, 6 week old fetus video, 6 week old fetus abortion, 6 week old fetus heart rate, 6 week old fetus miscarriage, 6 week old fetus ultrasound pictures, 6 week old fetus size, 6 week. Your baby at 11 weeks is 2 inches long and weighing in a whopping ounce! You could hold your little one in the palm of your hand at this point! Her little body is beginning to straighten out. Though it will be a few more weeks until the gender can be detected, if your baby is a girl her ovaries are beginning to develop. 6 Week Old Fetus.