“You won’t look pregnant at this point but already your baby’s tiny heart has begun to beat and pump blood. The heart is dividing into chambers and will find a more regular rhythm soon. Your baby is about a quarter of a centimetre long and looks more like a tadpole than a human being. He’ll have a growth spurt this week – the first of many!
He’s busily growing all his major organs, including the kidneys and liver. His intestines are developing and the appendix is in place. The neural tube, which connects his brain and spinal cord, will close this week.
All these internal developments are matched by changes on the outside, too. The buds that will grow into your baby’s arms and legs begin to sprout. And below the opening that will later form your baby’s mouth, small folds exist where the neck and the lower jaw eventually develop.”