The 9-Month Journey

4 Months

By the middle of this month, the external genitals are distinctly formed, making the fetus recognizably a girl or a boy. Facial features are also becoming more distinguishable, teeth are growing underneath baby's gums, and the fingers and toes are becoming longer and more defined.

The baby's senses begin to awaken, too. Studies show that if a bright light is shone into the uterus, the fetus will shield his eyes. He's also beginning to hear what's going on inside and out of the womb: The sound of your voice, heartbeat, and growling stomach will become familiar and reassuring.