By the second trimester, your baby is now in its fetal stage and measures 2 1/2 to 3 inches in length. Fully formed the heart rate can be heard with a special instrument called a Doppler.
Here's a great quote: "The body of the unborn baby is more complex than ours. The preborn baby has several extra parts to his body which he needs only so long as he lives inside his mother. He has his own space capsule, the amniotic sac. He has his own lifeline, the umbilical cord, and he has his own root system, the placenta. These all belong to the baby himself, not to his mother. They are all developed from his original cell." - Day & Liley, The Secret World of a Baby, Random House, 1968, p. 13
DID YOU KNOW?
Just as adults the baby at the fetal stage experiences the rapid eye movement (REM) sleep of dreams. Okay... why did you say you like REM's music?