A lot is happening during the eighth week of your baby's fetal growth. As you follow your baby's development week by week, you'll discover that changes are occuring rapidly in lots of areas. If you schedule a doctor's visit at around this time, your doctor may be able to detect a heartbeat by using an ultrasound. Your baby is beginning to develop arms, hands, fingers, feet, and even toes. Facial features are also beginning to appear, and intestines are forming in the umbilical cord.