Final answer:
Amniocentesis is a procedure to analyze the baby's genetic health using amniotic fluid. It is not done in the first trimester, and complications can occur despite the use of ultrasound. The presence of meconium in the amniotic fluid is concerning and can lead to complications and infections.
Step-by-step explanation:
Amniocentesis is a medical procedure where amniotic fluid is drawn out of the mother's abdomen in order to analyze the baby's genetic health. The fluid contains fetal cells that can be examined for genetic defects. It is not possible to perform amniocentesis in the first trimester and complications can still occur in about 5% to 10% of cases, despite the use of ultrasound. The presence of meconium in the amniotic fluid is always cause for concern as it can lead to complications and infections.