Your baby is starting to have sleeping and waking cycles, usually between 5 and 10 minutes long. You might even wake her if you cough! Your baby's body and limbs are now growing faster than her head, and she looks more and more like a tiny person. Most of her movements will be in her limbs as she starts to test her muscles, perhaps even kicking with her feet.
Your baby's ovaries are fully formed by now if she's a girl; if your baby is a boy, his testicles and scrotum are developed. However, it's still too early to distinguish your baby's sex on an ultrasound.
What else is happening? Your baby's organs are finalizing their shapes and functions. The development of her lung tissue is nearly complete, and although your circulatory system is still bringing nutrients and oxygen to your baby, her own blood supply is starting to get into the act. Meanwhile, glands in her pancreas are producing insulin and starch, and her intestines are starting to form folds in preparation for the day she'll digest food on her own.
Your baby's skin is starting to thicken as it acquires layers and becomes more opaque. Tiny hair follicles are appearing below the surface of her skin. Her jaw is starting to harden, and she has her first tooth buds, which will grow into tiny baby teeth. Her vocal cords are beginning to form too.
Originally published in You & Your Baby: Pregnancy.
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