Your Baby
The fetus moves, kicks, swallows and can hear your voice.  The skin is pink and transparent.  Umbilical cord continues to grow and thicken to carry enough nourishment from the mother to the fetus - but it also can pass along hazards like tobacco, alcohol and other drugs.  The placenta is now fully formed.  By the end of the fourth month, the fetus is 6 to 7 inches long and weighs about 5 ounces.

Your Body
Appetite increases as morning sickness goes away and you should begin to feel more energetic.  Towards the end of the fourth month (16-20 weeks), you might feel the faint movement of your baby for the first time.  Now it is time to tell your doctor.  Your belly begins to show - you probably will need maternity clothes and bigger bras this month.

Prenatal Care Guide
Visit your health care provider for one prenatal care checkup.  Pregnant women need extra iron - more than even a good diet can supply.  Your doctor may recommend iron supplements.  You'll probably gain about one pound a week, or 12 to 14 pounds, during the second trimester (months 4 to 6).  If your health care provider recommends prenatal testing using amniocentesis, or alpha-fetoprotein (AFP) testing for neural tube defects, they will be done between the 16th to 18th weeks.  By the end of the 4th month, the fetus is 6 to 7 inches long and weighs about 5 ounces.