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Home   1st Trimester   13 Weeks Pregnant

You’re 13 Weeks Pregnant!

What is Happening During Week 13?

This marks the beginning of your 2nd trimester!

All of your Baby’s organs, nerves and muscles are formed and are beginning to function together.

At week 13, bony tissue is developing around the head, within the upper and lower extremities and within tiny ribs. The facial features are clearly identifiable although the eyelids remain shut to protect the developing eyes. Your Baby’s tiny fingers have their own unique fingerprints.

Your Baby’s intestines, which previously formed part of the umbilical cord have now moved into Baby’s abdomen. Baby now looks more human with the head more in proportion to the rest of the body. Your baby is a little over 3 inches long and weighs in at around one ounce.

If you’re having a girl, she now has more than 2 million eggs in her ovaries by the time she reaches puberty she will only have about 400,000 left. A woman will ovulate only about 450 eggs in her lifetime because eggs will die a natural death. Unlike males that produce sperm throughout his life time females are born with a finite number eggs. If you’re having a boy, he is producing testosterone.

Did you know that the skin is the largest organ of the body? It is! If you could peak inside the womb you could clearly see the veins and organs of your baby through very thin fetal skin.

What Are You Going Through At Week 13?

During this time you may be offered an ultrasound, if you haven’t already had one. Ultrasound measurements early in pregnancy are accurate in predicting gestational age. There is little size variability during this time, meaning that, early in pregnancy, embryos grow at a similar size and rate. However, later in pregnancy the growth and size of Baby can vary.

The greatest value for you is to receive an ultrasound late in the first trimester or early in the second trimester to ensure the accuracy of gestational age and other vital information that could affect the long-term care of your pregnancy.

Once the menstrual age of your pregnancy and the estimated due date (EDD) have been calculated this date should never be changed. Earlier ultrasound measurements are always more accurate.

The beginning of your second trimester dramatically reduces your risk of miscarriage. You may still be experiencing fatigue and morning sickness or find you are no longer feeling any of the early pregnancy symptoms at all. These changes can be different for everyone.

Some of you may be wondering why you are already showing a bump. As I’ve mentioned in previous weeks, hormones can play havoc with your digestive system and this feeling that you’re showing a bump might actually be bloating cause by hormones. At this stage, your uterus is just beginning to move out of the pelvis, only the top of the womb is located just above the pubic bone. Again all these signs and symptoms differ from woman to woman and from pregnancy to pregnancy.

It actually takes about 20 weeks for the top of the uterus to rise as high as the navel (belly button).


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