one question linked to this months blog topic is… Is the 3rd trimester of pregnancy different from the 1st? the answer is yes the 1st trimester is all about the pregnancy settling into the uterus the fertilized egg inplanting into the wall ,half the cells form the placenta the other half the embryo cell structure deviding, nerve endings to form spine,limbs the fetus takes on a total transformation from egg cell to human being . The fetus is small during the 1st trimester and is fully formed by the end of the 1st trimester of pregnancy.The 2nd trimester baby gows in size the 3rd trimester inner organs mature and baby gains body weight ready for the outside world.