your baby  is about the size of a poppy seed

                               your BABY AT 4 WEEKS

 HOW YOUR BABY GROW

  BY Four weeks of pregnancy  the ball of cells in your womb  has developed into an embryo. Although it's  only the size of a POPPY SEEDS  a lot is happening.

  There are two layers of developing cells/ the epiblast which will for your  entire baby,and he hypoblast which is a temporary layer of cells.

The embryo is surrounded by an amniotic sac, which is filled with fluid to cushion and protect it/ The placenta is in the early stage of development and also has two layer. Some cells are  tunneling into the lining  of your womb to provide an oxygen supply from you to your baby; while other cells are producing the hormone human chorionic gonadotrophin  which gives you that big fat positive on your pregnancy test;.

   At about 10 weeks the  placenta will  supply your baby with the nutrients she requires/ until then a small yolk sac provides all the nourishement  the embryo needs.

 From now until 10 weeks all of your baby's  organs will begin to develop  and some will even begin to function. This is one of your baby's most important periods of development. Taking folic acid supplements  during this  important stage can help to prevent defects, such as spine bifida.