The Second Trimester Of Pregnancy


The second trimester pregnancy marks the midpoint in the development of your baby. Significant maturity is seen in the lungs and the central nervous system.  The baby also starts to respond to the voice of the mother.

The second trimester pregnancy marks the middle portion of the duration of pregnancy. It begins at week thirteen and ends by week twenty seven.


Week  Thirteen – Week Eighteen


At this stage of your pregnancy the sex of the baby becomes apparent. There is also the start of red blood cell formation in the baby’s spleen. If the baby turns out to be a girl, ovarian follicles will develop.  For boys, the beginnings of the prostate will start to commence. At this stage of development the baby is about 87 millimeters and weighs an average of forty five grams. By the fifteenth week of pregnancy the skeletal system begins to develop and grows at a rapid rate. This is what is discerned when an ultrasound is done after a few weeks.  The scalp pattern will also begin to develop. By week 16 the baby begins to make sucking movements with his mouth. By week seventeen there is some fat accumulation and your baby begins to hear by week eighteenth.


Week Nineteen – Week Twenty Three


This portion of the second trimester pregnancy is known also as the halfway point of the trimester.  Vernix caseosa, a cheesy coating like substance will develop in the growing baby. This substance acts as a protecting barrier from abrasions that may occur while the baby is moving within the womb as a result of chapping due to amniotic fluid.  By week twenty one, the baby is now able to do some swallowing movements. You will notice that he is slightly more active than before. By Week 22 your baby’s hair can now be appreciated. Lanugo covers the entire length of the baby.  Fingerprints as well as footprints of the baby begin to develop by week 23.  For boys, the testicles start descending from the stomach and for girls, the ovaries and uterus are now in their proper places.


Week Twenty Four – Week Twenty Seven


At this stage of the second trimester pregnancy, real baby hair now grows on the growing head. At this point, the baby has regular sleep and wakefulness cycles already. By week 25, the baby begins to respond to the mother’s voice. By week 26, the fingernails start to form and the lungs start producing a substance called surfactant that keeps the lungs from collapsing. By the end of week twenty seven, the baby’s lungs and central nervous system are reaching the peak of their intra uterine development.

Sorry, no content matched your criteria.