13 weeks pregnant

This is the last week of your first trimester and your baby weighs 14 to 20 grams. The crown-to-rump length of your growing baby is 2.6 to 3.1 inches. ( Our baby is supposely a big bigger by now, since it was 3 inches 1 week ago already )
Your baby is now about the size of a peach. Fetal growth is amazing from now through about the 24th week of pregnancy.

At this point of your pregnancy, there is a steady flow of pregnancy hormones in your bloodstream. Your body will adjust to the changes and morning sickness might stop and other early symptoms will begin to ease. Because the second trimester is approaching, feelings of anxiety or nervousness may also diminish. You have probably gained some weight by now. You are losing your waist and your clothing is probably fitting snugly.

There is a milky membrane that surrounds your baby. It is pierced by the umbilical cord and is made up of two layers, which are fused together. Your placenta provides most of the nutrients and oxygen that your baby needs. By this week, the placenta is well formed and ready to take over hormone manufacture from your ovaries. The placenta will produce progesterone and estriol. These hormones will be crucial in the maintenance of your pregnancy. 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.



The Baby
The baby is getting so big now he's starting to push up your uterus. He weighs just over an ounce (30 grams) and measures almost 3 inches (about 7 centimeters). When not pregnant, a normal uterus is about the size of a small pear. Twelve weeks into the pregnancy, the uterus has grown to the size of a big pear, after 16 weeks it's as big as a grapefruit and when you're 20 weeks pregnant it's the size of a small melon. After 24 weeks of pregnancy it has become as big as a baby watermelon and after 28 weeks it is similiar in size to a balloon that's not fully inflated. By the time you're about to give birth, your uterus is as big as a fully inflated balloon. Your cervix represents the tightly closed mouth of the balloon.

A uterus can be positioned leaning towards the front or the back. If yours is positioned towards the front, you can feel your uterus with your hands above the pubic bone from now on. You can also have your partner or your children feel it if they want. If it doesn't really work out yet, try it again in one or two weeks. Throughout the entire pregnancy you can have normal 'pulling and stretching' pain. Sometimes during the little one's growth spurts, your organs - such as your stomach, liver, pancreas and gall bladder - literally have to make way for your rising uterus. Your uterus is a hollow, muscular organ that always has a certain amount of tension and responds to its surroundings, such as during an orgasm. Now that there's a baby growing inside you, your uterus can harden or tighten briefly during such a growth spurt or when you're doing familiar activities or having an orgasm. That's all normal. You may feel it more often when you're stressed or have a full bladder. These mild uterine contractions are good for the baby -- it feels like a kind of hug, a sign that his mother is there for him. They even have an official name: Braxton-Hicks contractions. First time moms may not even notice them until week 20 or so, where experienced moms may notice them much earlier.