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Week-by-Week Fetal Development Week 12 Guess what? This week your baby will pass urine for the very first time. But you will have to wait quite a while before you can toilet train him or her. But still it is quite exciting and you may want to commemorate this particular week for the yet unborn. He has also learnt to suck and can swallow the fluid that surrounds him (therefore the need to urinate) as well as use the muscles of his mouth to frown, pout and open and close his jaws. In fact, quite a few of his muscles are developing and so the baby tends to move around quite a lot. Not all the muscles are working just yet but he can use the muscles that will aid him in breathing after birth. There is good coordination between his brain and a few muscles that help him to curl his little toes or make a fist, rotate his wrists and feet or happily play football in the amniotic sac. Well, at least he seems to have started on the warm up exercises. Toenails, fingernails and the earlobes
have also made their anticipated appearance as the umbilical cord starts
to circulate blood between the membranes on the uterus wall and the fetus
to provide nourishment to the baby. The placenta is now in action.
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