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Week-by-Week Fetal Development Week 31 Over the next seven days the lungs will develop fast in preparation for delivery which is not too far away. A layer of cells are forming a lining in the air sacs to produce a liquid called 'surfactant' that serves to prevent these air sacs from collapsing between each breath when the baby begins to breathe after birth. This week the vernix and lanugo will gradually begin to fade and your baby's skin will grow softer and smoother. He will have grown quite plump by now as his skin begins to fill out. Your baby now measures about one
foot and three and a half inches or 39cm. and weighs approximately three
pounds and two ounces or 1.4kg.
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