Baby: Your fully formed fetus, now in about its 11th week of development, measures 2.6 to 3.1 inches from crown to rump and weighs between half an ounce and seven-tenths of an ounce -- about the size of a peach. The head is still disproportionately bigger than the body, but the rest of the body is starting to catch up. In fact, your baby is growing rapidly these days. The face is starting to look more human, with eyes moving closer together. Toes and fingers are clearly separate, and ankles and wrists have formed. External genitalia are becoming visible. Intestines are shifting into their proper place, too.
Mom-to-be: Your uterus has grown a lot. It's filling your pelvis now and starting to grow upward into your abdomen. It probably feels like a soft, smooth ball. If you haven't put on any weight yet because of morning sickness, you'll begin to now as you start to feel better.
Tip for the Week: It's easy for your partner to feel left out of the pregnancy since he isn't feeling the same physical changes that you are. Both of you should share your excitement about having a child, your dreams, worries and your partner's level of involvement. Suggest that your partner goes to a check-up with you to hear the baby's heartbeat.Week 14
Baby: Your baby measures about 3.2 to 4.1 inches from crown to rump now and weighs almost an ounce. The ears are shifting from the neck to the sides of the head, and the neck is getting longer and chin more prominent. Facial features and unique fingerprints are all there. Your baby is beginning to respond to outside stimuli. If your abdomen is poked, the fetus will try to wriggle away.
Mom-to-be: You're probably wearing maternity clothes now. Your skin and muscles are starting to stretch to accommodate your growing baby. You may notice some constipation because pregnancy hormones relax the bowel.
Tip of the Week: Try to alleviate constipation with moderate exercise, and by drinking plenty of fluids and eating lots of fruit and vegetables, preferably raw.
Week 15
Baby: Your 13-week-old fetus now measures about 4.1 to 4.5 inches from crown to rump and weighs about 1.75 ounces. Its body is covered by an ultrafine hair, called lanugo, which is usually shed by birth. Eyebrows and hair on the top of the head are beginning to grow. He may even be sucking his thumb by now. Bones are getting harder.
Mom-to-be: Your uterus can probably be felt about 3 to 4 inches below your navel. Sometime in the next five weeks you'll be offered a quadruple marker screening test, which measures four chemicals in your blood -- alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), inhibin A, and estrogen produced by the placenta. The test is a more accurate predictor of Down syndrome than AFP testing alone. Amniocentesis, which tests a small sample of amniotic fluid withdrawn by an ultrasound-guided needle, is usually performed between now and 18 weeks. It may be recommended if you're 35 or older or if your AFP or quadruple marker screen test results were suspicious.
Tip of the Week: Start learning to sleep on your left side because circulation is best that way. Lying on your back or stomach after about the fourth or fifth month can put extra pressure on your growing uterus and decrease circulation to your baby. You can try tucking pillows behind you and between your legs. Some manufacturers make a pregnancy pillow that supports your entire body.
Week 16
Baby: Your baby now measures about 4.3 to 4.6 inches from crown to rump and weighs about 2.8 ounces. Fingernails are well-formed and the fine hair, lanugo, may be growing on the head. Arms and legs are moving. The nervous system is functioning and muscles are responding to stimulation from your baby's brain. You may be able to hear the baby's heartbeat in the doctor's office.
Mom-to-be: Your uterus has grown significantly by now and weighs about 8.75 ounces. Within the next few weeks you may start to feel your baby move, called "quickening." It's often like a gas bubble or subtle fluttering movement. As it happens more regularly, you'll know it's your baby. There are other physiological changes happening in your body. Increased blood volume to support your growing fetus may produce nosebleeds, and leg veins may become more apparent. Your uterus is shifting so you may not have to urinate so much.
Tip of the Week: If veins in your legs are beginning to bulge, you may want to use support stockings, elevate your feet when you can and exercise to improve blood flow.
What's Happening Inside You?
Your baby's fingers and toes are well-defined; eyelids, eyebrows, eyelashes, nails and hair are formed. Teeth and bones become denser. Your baby can even suck his or her thumb, yawn, stretch and make faces.
The nervous system is starting to function. The reproductive organs and genitalia are now fully developed, and your health care provider can see on ultrasound if you are having a boy or a girl. Your baby's heartbeat may now be audible through an instrument called a Doppler.
By the end of the fourth month, your baby is about 6 inches long and weighs about 4 ounces.
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