August 2013 Moms

Week by week?

So I was looking a head at the baby sizes and noticed it jumps at twenty weeks from 6.5 in length to 10.5. In one week! And it's the only week that jumps so much. I guess my question is why is this? Sorry ftm and probably a dumb question. But I don't understand a jump of 4 inches in one week!
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