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Your baby is experiencing some serious sensory action this week as the brain develops specialized areas for each of the five senses. Aside from the sensory explosion, your baby begins to grow a white, waxy skin coating this week. Called vernix caseosa, this coating ensures your fetus’s delicate skin doesn’t become scratched or pickled in its bed of amniotic fluid. If your baby arrives prematurely, he or she may still be coated with an entire layer of vernix, although most babies will shed much of this pre-birth. In addition, this week brings about the development of brown fat, which will help keep your fetus warm after birth. About now, your baby is the size of a large heirloom tomato, weighing about 8 1/2 ounces and measuring six inches. In other news, your little one is essentially proportional now, from the legs to the arms to the head. The organs are well-developed and become easier to view sonographically Your fetus’s kidneys continue to make urine and the mini-lungs continue to “breathe” amniotic fluid. For more on your little one’s developmental progress, get your weekly play by play right here.