Fetal Development This Week
Fetal Brain Development
Your baby's height and weight haven't changed much in the past week, but the big news is your baby's brain gain. Until now, the surface of your baby's brain was smooth. Now, your fetus's brain is taking on those characteristic grooves and indentations. The reason for this change in appearance? Those wrinkles allow for an increased amount of brain tissue — a necessary change as your developing baby prepares for life outside your womb, and the street smarts he or she will need.
Another big change at 30 weeks pregnant: Your baby's bone marrow has taken over production of red blood cells (before, tissue groups and then the spleen took care of producing the blood cells). This is an important step for your baby, because it means he or she is better able to thrive on his or her own once born (with a little TLC from you, of course).
So it's in with the new (brain cells, red blood cells) and out with the old (lanugo). Much of the lanugo — the soft, downy hair covering your baby's body — is beginning to disappear now because both fat and the brain are regulating your baby's body temperature (so no need for that furry coat anymore). But you may see a few leftover strands of fur on your newborn's back and shoulders.
What is happenning now?
You are now 30 weeks pregnant, which is the beginning of week 31.
Your baby has grown to be about 16.5 inches long from head to toe () and approximately 3lb 5oz in weight.
Your baby's brain is increasing in size and complexity and the pupils of their eyes can now respond to light, allowing your baby to focus more readily and see dim shapes. Your baby now has definite sleep and wake patterns, although they may sleep up to 95% of the time and have noticeable rapid eye movements (REM), which indicates they may be dreaming! Many women notice their baby tends to be more active when they are resting, perhaps because when you move your body naturally rocks your baby to sleep.
Did you know? Scientists have recorded the brain waves of unborn babies. At 7 weeks they are sporadic, but become noticeably more consistent by 10 weeks. Unborn babies have one continuous distinct brain wave pattern by 22 weeks and 2 distinct patterns (similar to adult brainwaves) by 30 weeks.
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