Feel like your baby is bouncing off the walls? It's no wonder -- her living quarters are getting pretty snug these days. Measuring from head to toe, she is, on average, over a foot tall and very likely weighs in at over two pounds. Most of this gain has been in bone and tissue -- she is still quite slender, with very little body fat. Fat will be laid on during the third trimester, the better to keep her warm when she leaves the climate-controlled comfort of your womb.
To support the fetus's growing body, the spine is getting stronger and more supple. Though no longer than the span of the average adult hand, it is now made up of 150 joints and some 1,000 ligaments.
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