Weeks 17-20 – Gestational Age / Weeks 15-18 – Fetal Age
** Gestational age is the age of the pregnancy from the last normal menstrual period (LMP) and fetal age is the actual age of the growing baby.
The baby has reached a point where movements are being felt more often by the mom. The eyebrows and eyelashes grow in and tiny nails have begun to grow on the fingers and toes. The skin of the fetus is going through many changes and begins to produce vernix at the twentieth week. Vernix is a white pasty substance that covers the fetus's skin to protect it from amniotic fluid. A fetal heartbeat could be heard by a stethoscope now. The fetus has reached a length of 8 inches and weighs about 9 oz.
Source: American Pregnancy Association