The baby’s legs and arms are exceptionally thin at this point because body fat has not yet begun to deposit there, but the limbs are moving independently, being controlled by the child’s brain. The umbilical cord, seen here behind the feet, is usually about 50 cm (20 inches) long.
The child can now make a fist with fingers that are fully differentiated. Fingernails can be seen and the child’s skin is almost transparent. His arms have lengthened to be in proportion to the rest of his body. In this photograph, oxygenated blood can be seen in the blood vessels running to the child’s fingertips.