The skeletal system and nervous system have made enough connections to coordinate limb and body movement. In addition, your baby's facial muscles are now developed well enough to allow for a variety of expressions. Inside your uterus, your baby may be squinting or frowning at you, although these movements aren't conscious expressions of emotions.
Your baby's skeletal system is continuing to develop as more calcium is deposited on the bones. If you're having a girl, millions of eggs are forming in her ovaries this week. Beginning at 16 weeks, your baby's eyes are sensitive to light.
Although you probably don't even know it, your baby may be having frequent bouts of the hiccups. Hiccups often develop before a baby's breathing movements become common. Because your baby's trachea is filled with fluid rather than air, the hiccups don't make that characteristic hiccup sound.
At 16 weeks into your pregnancy, your baby is between 4 and 5 inches long and weighs a bit less than 3 ounces.
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