13 weeks

Your Baby

Buckle up folks, we're about to heading into trimester two!


Your little womb tenant is getting bigger and smarter every day! Their skin is paper-thin and rather see-through, showing off all their shiny new functioning and still-developing organs.

Their sense of taste and smell are more developed and refined while their cozy amniotic sac continues to increase in size and mass and fill with more fluid.

As we embark on the second trimester, it's time for your manatee-to-alien-to-tiny-weird-human to evolve into monkey baby!

Little hairs, known as lanugo, will start to cover your baby's body this week, which will eventually be shed some time after birth.

Of all the trimesters, this one has been the most critical to ensuring your baby's development is on the right track.

The current size of our little one.....

Your baby can make a fist and even suck his or her thumb this week—both skills that are über-cute during infancy ... and not so much at the age of 9. If you're really lucky, you might catch a glimpse of baby's thumb sucking on an ultrasound photo. That's a framer! Other exciting developments include:

Your baby's eyelids are fused shut to protect his eyes as they develop. His bones and skull are solidifying and soon itsy-bitsy ribs may appear. (Baby ribs! How cute is that?!) Baby's intestines are finally right where you want them—in his or her belly instead of poking out into the umbilical cord. Baby's tooth sockets are all loaded and ready to pop out baby teeth six or seven months after baby is born (causing baby a lot of pain and you a lot of lost sleep).

Who's that singing? Elton John? Could be your baby: His vocal cords and larynx are completed now.

Your baby-to-be now weighs about 20 grams and is nearly 3 inches long, or about the size of a Nutter Butter, covered in chocolate. OK, it doesn't have to be covered in chocolate, but isn't everything better that way?

Tissue that will form your baby's bones is being laid down, especially around the head and limbs. The nose and chin are becoming more prominent. Your baby's eyelids meet and fuse together and they will not open again for nearly four months. The eyes started out on the side of your baby's head and they are now moving closer together on the face. The ears come to lie in their normal position on the sides of the head. If examined outside of the womb, you will be able to distinguish male from female at this time.


The sockets for all twenty teeth are formed in the gums, and vocal cords are beginning to form.