Your Baby Week 31:

Your baby now weighs about 3.5 lbs (1600g) and measures about 18 inches (40cm) in total and about 11.2 inches (28cm) from crown to rump.

Your baby's increasing size means that she has less room to move around in your uterus.

Your baby could already be moving into the head-down position.

Your baby's lungs are maturing and their lining, which prevents air sacs from collapsing, is growing. This lung development means that your baby would have a much greater chance of survival if he were born prematurely.

About 16 fluid ounces of blood are flowing through the wall of your uterus to the site of the placenta, though your blood never mixes with your baby's blood. It is separated by the placental barrier which is a very thin wall. Water, nutrients and waste are exchanged across this barrier at a rate of 0.3 fluid ounces per second.

Your baby swallows amniotic fluid and urinates.

Your baby's ears are sufficiently developed to hear and recognize your voice, the voices of other family members as well as familiar musical tunes. 

 


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