Here's what's been going on gestation-wise for the past couple weeks:
Week 16 
Fetal Development 
 Fingernails and toenails are growing too.  In fact, some babies need their nails clipped right after birth!If you haven't already, you may begin to feel movement as the baby's bones harden.  If you are somewhat overweight, have a  thick uterus, and/or if this is your first pregnancy, you may not be  feeling baby yet or feeling baby regularly.  Don't panic!  You will  soon.  The legs are now longer than the arms, and s/he is moving those  arms and legs frequently, especially since there's still lots of room to  move within the uterus.   
Maternal Changes
Do you have a stuffy nose or nosebleeds? As mentioned before, your blood volume increases 40% - 50%. This affects your estrogen levels which in turn swells your nasal membranes. This increased blood volume also causes your heart to work harder to support your pregnancy. This isn't a problem for a healthy heart. Your ligaments continue to stretch, and you may be feeling achiness and pain in your abdomen.
Maternal Changes
Do you have a stuffy nose or nosebleeds? As mentioned before, your blood volume increases 40% - 50%. This affects your estrogen levels which in turn swells your nasal membranes. This increased blood volume also causes your heart to work harder to support your pregnancy. This isn't a problem for a healthy heart. Your ligaments continue to stretch, and you may be feeling achiness and pain in your abdomen.
Week 17
Fetal Development
This  is a period of rapid growth as the fat begins to form underneath the  baby's skin.  Baby and placenta are about equal in size now.  The tiny  heart is pumping as much as 25 quarts of blood a day!  The reflexes are  probably in place now as the baby sucks, swallows and blinks.
 
 
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