This week of pregnancy, your baby is about 19 1/2 – 20 inches in length and weighs over 5 pounds. Your baby is developing immunities to mild infections, caused by antibodies crossing the placenta.
If your baby was born now, he or she would survive with no major problems. There should be a sufficient amount of surfactant in your little ones lungs for them to work well on their own, although he or she would loose weight considerably faster than a full term baby. The digestive tract is still too immature for complete independence yet. Plus, your baby really needs the next few weeks to finish plumping up before birth.
You may be feeling more and more tired and uncomfortable as the weeks go by. You may also have some trouble moving around because your belly is getting so big. You may notice an occasional tingling or numbness in your pelvic area, which is caused by the weight of your baby pressing on nerves in your pelvis and legs. Some women describe this pressure as a “pins-and-needles” sensation. Lie on your side to help decrease this pressure in your pelvis and if it doesn’t go away with rest, then contact your doctor or midwife.