Welcome To Week 16

Fetal development in pregnancy week 16: fetus in fourth month

Over the past three weeks your astounding growing baby has managed to stretch yet another 2 full inches (totaling about 4.5 inches) and weighs around 3.5 ounces. Yessireee, that’s some pretty serious growth... and with it comes several physical developments! For starters, their head to body ratio is finally starting to even out a bit as the rest of the body is actually growing faster than the head at this point. Yes, your little light bulb is not so top-heavy. Their adorable little limbs have lengthened, almost reaching their normal proportions which they will have at birth. Their eyes are still closed but moving and if you had an ultrasound, which many doctors recommend you have at about this time, you may even see your little one sucking on a thumb, not to mention the necessary signifiers to let you know whether you’ve got a wee lad or lassie.

And how's mom doing? Along with an ultrasound, many practitioners recommend administering the “Multiple Marker Test (MMT)”, which is also known as the “Triple Screen Test”. This very common procedure checks your blood (not your baby’s) for specific protein and hormone levels as well as informing you about any potential of genetic or birth defects. Before you start breathing in that strained fearful way or furrowing your brow in concern, you should know that even if you do get a positive test this hardly means your little trooper is in trouble. Only about 3 to 5 percent of women yield positive results and of those women, only 10 percent actually have any sort of complication to report. Obviously, a positive test from the MMT will mean further testing for you, including amniocentesis and more ultrasounds. Although this test sounds like a bit of a dud with the high percentage of false positives coming back, it's popular because it has and can effectively identify a majority of all neural tube defects as well as babies with Down Syndrome. So despite its obvious drawbacks, you’ll still want to arrange to take the test to better prepare you and your family for the fact that anything is possible. (see BabyCenter's page for additional information.)