My Baby - Your baby has now developed his sense of balance, so he can tell which way is up inside your belly. (The inner ears control this skill, and as of this week they're fully formed.) There's still enough room in there for him to easily flip around, tethered by the umbilical cord. The cord, by the way, is pretty darn amazing. It contains two arteries and one vein and is quite long -- by birth, most average around 2 feet long! Every 30 seconds, nutrients and oxygen-rich blood travel from the placenta to the fetus through the single large vein. Then the blood returns to the placenta through the two arteries. It's an ingenious system that ensures the baby gets what he needs while keeping your blood separate from his.
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