At four months in utero, the baby's brain has begun maturing - a process that will continue until she is about 14 years old.  Her eyelids are now sealed shut and will re-open at seven months.  Her taste buds are now working.  Nutrients consumed by her mother are passed on to her within an hour or two.  Three hundred quarts of fluid a day are sent to the baby via the umbilical chord.  Fine hair begins to grow on head, eyebrows and eyelashes.  Facial expressions similiar to the baby's parents can be seen at this time.  This month REMs (rapid eye movements) have been recorded - a sign of dreaming.