25 Weeks!!!

According to "What to expect" this week, baby is about 9 inches long & more than a pound & a 1/2 in weight this week.
The baby's skin is turning pinker this week, not because he or she's getting overheated (in fact, the amniotic fluid is perfectly climate controlled, keeping the baby at an always comfy temperature), but because small blood vessels, called capillaries, are forming under the skin & filling with blood. Later this week, blood vessels will also develop in the baby's lungs, bringing them one step closer to full maturity & one step closer to taking that first breath of fresh air. But those lungs are still very much works in progress. Though they are already beginning to develop surfactant, a substance that will help the lungs expand after the baby is born, the lungs are still too undeveloped to sufficiently send oyxgen to the bloodstream & release carbon dioxide when he/she exhales.
The lungs aren't the only system that's gearing up for air intake. The baby's nostrils, which have been plugged up until now, are starting to open this week. This actually allows our little one to begin taking practice breaths. (Of course, since there's no air in there, the baby is really only "breathing" amniotic fluid, but it's the practice that counts, right?)