• human embryo with groove along its length
    Week 5 of Pregnancy
    You are 4 Weeks and 5 Days Pregnant
    Your baby todayThe embryo, still less than 3 mm long, now has a deep and narrow groove extending along its entire length. This groove will soon become so deep and its edges will curl over so much that it forms into a tube running along the length...
  • ultrasound of human embryo at 4 weeks 6 days
    Week 5 of Pregnancy
    You are 4 Weeks and 6 Days Pregnant
    Your baby todayThe upper part of the embryo is shown. There is still a wide opening along the back of the embryo that will gradually close over the next few days. The head and lower spine portions are the last to close. ...
  • amniotic cavity of embedded blastocyst
    Week 5 of Pregnancy
    4 Weeks (& 1 Day) Pregnant: Signs, Symptoms and the Size Of Your Baby
    Your baby today Fetal development begins the moment the egg is fertilized. This week your baby is the size of a poppy seed, and while this may seem small, your baby is already 10,000 times larger than they were at conception! By four weeks of p...
  • human embryo developing its third layer
    Week 5 of Pregnancy
    You are 4 Weeks and 2 Days Pregnant
    Your baby todayThe embryo until this stage of development has consisted of two layers of cells. Now, a third layer starts to become visible as a "bulge" between the two-this bulge can be seen in the center of this image. ...
  • Pregnancy
    Week 5 of Pregnancy
    You are 4 Weeks and 3 Days Pregnant
    Your baby todayAs the embryo transforms from two cell layers into three, a groove develops along the back of the embryo. This groove will develop in the embryo's neural tube-the forerunner of the brain and spinal cord. ...