Fetal Development

...: Not measurable. Fetal Development Milestones: Fertilization! What You're Seeing: This week is when your.... Fetal Size: 1/18 to 1/16th of an inch (about the size of the pen dot). Fetal Development Milestones.../6 to 1/4 of an inch. Fetal Development Milestones: Baby-to-be takes on a tucked, C-shape. Head, legs...

...Fetal Size: Length, 3 1/4 to 4 inches, crown to rump; weight, around 1 ounce. Fetal Development... to 4 1/2 inches, crown to rump; weight, 1 3/4 ounces. Fetal Development Milestones: Baby's skeletal.../2 ounces. Fetal Development Milestones: Fetal bones are becoming more visible on ultrasound. You may...

.../2 pounds. Fetal Development Milestones: Your baby now has added brain tissue and her scalp hair continuing.... Fetal Development Milestones: Your little one's muscles are maturing. She'll continue to gain weight..., 11 3/4 inches, crown to rump; total length almost 18 inches. Weight, 3 1/2 pounds. Fetal Development...

Can an ancient Chinese calendar really predict the gender of your baby? Take our simple quiz and find out. The results could spill the beans about whether you're having a boy or girl.

Are you pregnant and wondering if you are having a girl or a boy? Take this gender prediction quiz that predicts the gender of your baby!

You know you're pregnant, but when exactly will your baby make his big entrance? Use our pregnancy due date calculator to find out.

Wonder how big your baby is now? Here's an approximate look at size, weight and height in the second trimester.

A stunning, month-by-month photo gallery of pregnancy.

... babies, he was born with well-developed senses that helped him adjust to his new environment. When he... and Mind Develop in the First Five Years of Life. Learn how your child's senses progress in utero... and during the first year, and how you can help them along. Developing baby: By the third trimester, a fetus...

.... Airway passages form tubes in order to take in and expel air. Blood vessels and air sacs develop... in the fetal lungs begin to produce surfactant, a substance that keeps the sacs from sticking together. All... of this means that your baby's lungs have developed enough so that, conceivably, your little one could survive...

..., and body type -- have been set since the moment of conception. Your developing baby, now called a zygote... and develops into two fetuses, the result is identical twins. They may share a placenta, but each baby usually..., but trust us: Super-important developments are already under way. This week the embryo splits into two parts...

What's going on with your baby in pregnancy week 14? Find out all about important pregnancy milestones and exciting fetal development specific to this week of pregnancy!

.... Fetal development milestones: This week the babies are registering fetal heartbeats. Blood is pumping.... Fetal development milestones: Lots of little arms and legs are growing and elongating this week! Facial... to rump. Weight, almost 1 ounce. Fetal development milestones: Kidney and urinary tracts are now...

... finding that your clothes are tighter. At this point in your baby's development, expressions begin... of amniotic fluid. This helps the lungs to develop and grow. At somewhere around three inches long, your baby...

.... Fetal breathing movements in the last third of pregnancy are intermittent -- after all, baby is getting..., the protein that is essential for the lungs' healthy development. Strange but true: In human fetuses...'s activity level. While fetal movements slow down, they're still going on. Take a little time each day...

Experts answer your top questions about your developing baby's movements, from when she'll start kicking to how often you should feel her kick.

From the time of conception until the time you give birth, your body is going to go through some major changes. Find out what to expect with our week-by-week look at your changing body.

... to develop. You might even notice after birth, your baby prefers to tuck into this familiar shape, knees... cord. To keep track of your baby-to-be's growth and development, the sonographer will measure..., this measurement will be used throughout your pregnancy to make sure that the baby is developing on schedule...

..., or an X chromosome, which makes a girl. But until this point in its development, the embryo has had...'s entered his final stage of embryonic development at this point, and within the next week he'll make..., which had been developing inside the umbilical cord, have now begun slipping into the embryo's abdominal...

What's going on with your baby in pregnancy weeks one and two? Find out all about important pregnancy milestones and exciting fetal development specific to these weeks of pregnancy!

Could there be a boy or a girl in your future? Take our fun quiz, based on ancient beliefs about gender prediction.

Are you having a boy or a girl? These old wives' tales are a fun (but not scientific!) way to guess the sex of your baby.

... for immunities against infections, but in the past few weeks, her own immune system has begun to develop...

... and measures 12 to 16 inches. With the big job of organ and nerve development just about wrapped up, your baby..., space starts to get cramped and, in turn, fetal acrobatics decrease. Your baby likely tops three pounds...

..., she's got eggs of her own. As of this week, a female fetus's ovaries have already developed the tiny... may even develop and grow, thanks to those supercharged female hormones flowing from mother to baby.... But these tiny eggs, or ova, never develop to the point of ovulation. That won't happen for years and years yet...