Crouching Baby, Hidden Kicker
Remember when you used to wonder whether that funny feeling you had in your stomach was the baby kicking or just hunger calling? No more confusion there.
By this month, your baby should be rolling, tumbling, kicking and poking away in your belly. She's gaining weight quickly, and her muscles and motor skills are developing. Of course, none of these developments will come as a surprise to your ribcage.
By the way, some babies keep day hours, while others are night owls. And certain babies are more active than others. Be sure to talk to your doctor about exactly what sort of gymnastics your baby is performing these days.
Habituation: Learning to Tune Out Her Environment
If you live on a busy street, eventually you get used to the noise and can sleep through it. This "tuning out" is called habituation, one of the earliest, simplest forms of memory. Your baby is starting to learn this skill now, and she'll get even better at it after birth.
Waiting to Inhale
Your baby's lungs won't function until after she's born. They don't need to, since right now you're breathing for her. But she is seizing this opportunity to get her lungs ready for their big debut.
At about this time, her lungs start producing a fatty substance called surfactant. It covers the inner lining of her air sacs, allowing them to expand more easily once she needs to take that first breath.