13 weeks: Our baby Cashew
Your Baby This Coming Week
Your baby measures about 3.2 to 3.5 inches (7.6 to 8.9cm) from crown to rump and weighs about 0.9 ounces (25g). Your baby is now nourished by the placenta.
His face is developing and his cheeks and the bridge of his nose are appearing. His ears are moving from the sides of his neck to higher on his head and his eyes are moving closer together. Your baby's external genitals are now distinct and may be recognized on an ultrasound. Your baby will move away from stimuli near your tummy, such as noise and light.
Your baby's eyebrows have formed and a small amount of hair, called lanugo, has appeared all over his body. Lanugo, which will be shed before birth and replaced with the hairs with which your baby will be born, is thought to have a protective function.
Insulin is present in your baby's pancreas. Some bones may be well outlined. Your baby's thyroid gland, already developed by this week, begins to make hormones.
Baby boys begin to develop the prostate gland at this time and the ovaries of baby girls descend from the abdomen into the pelvis.