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Quick GuideFetal Development Stages: Month by Month Embryo Pictures
Although amniocentesis (removal of a sample of amniotic fluid with a long, thin needle) is most often done during the second trimester, there are certain conditions that may warrant an amniocentesis later in pregnancy. These conditions include a suspicion of chorioamnionitis or a risk of premature delivery, since amniocentesis fluid can be used to estimate maturity of the fetal lungs.
Ultrasound examinations may be performed in the third trimester if needed to help evaluate fetal growth and look for problems with the placenta.
Medically reviewed by Wayne Blocker, MD; Board Certified Obstetrics and Gynecology
"Protect Your Baby from Group B Strep!" CDC.gov. Updated Jul. 11, 2016.