Week 12 

Your Baby

How big is my baby?

Your baby is approximately 60mm (2.5 inches) in length and weighs between 9 and 14 grams (0.3-0.5 ounces). The baby is moving about a lot but is still too small for you to be aware of the movements.

From this week onwards your baby is recognisable as a human being and is now called a fetus as opposed to an embryo. Now, or close to this time, you should be able to hear your baby's heartbeat with a Doppler (a special listening device).

The fingers and toes develop, and nails and teeth are beginning to form. The skeletal system, which began developing earlier, now has centres of bone formation (ossification) in most bones. The external genital organs are growing. The amount of amniotic fluid is increasing.

The nervous system has continued to develop, and the digestive system is now capable of making the contractions that process food.