Week 25

Your baby is growing by leaps and bounds, reaching nine inches in length and passing the pound and a half mark. Under his skin, capillaries are forming and filling with blood and by week’s end, air sacs (also lined with capillaries) will develop in his lungs, getting them ready for that first breath. Mind you, those lungs aren’t ready for prime time just yet — but they are developing surfactant, a substance that will help them expand after birth. And speaking of breathing, your baby’s tiny nostrils, which have been plugged up until now, are starting to open and his vocal chords are getting ready to roar.

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