Your baby is now approximately 2.5–3.5 inches (7 cm) long and should weigh about 12-14 grams (.49 ounces). Your baby’s brain continues to develop and will continue to grow from this point on but will maintain its current shape. At the base of your baby's brain, the pituitary gland is beginning to make hormones this week. Your baby has also started developing nerves and a spinal cord which allows him/her to feel some types of pain.

Fingers and toes have separated and hair and nails are starting to form. Your baby’s vocal cords are also formed this week. The kidneys gain function as he starts swallowing amniotic fluid and passes it out as urine. His digestive track is also strong enough to push through bowels and absorb glucose.

Most importantly, your baby’s heart is beginning to pump several quarts of blood daily. This can be heard with the aid of a doppler (a special listening device). The heartbeat will be very fast, like the clicking of horse hooves.

The external genitalia have also developed and will being to start showing signs of either the male or female sex. Though your health care provider may guess the sex, there is still a lot of uncertainty.