Mother:

• Period stops.

• Breasts become larger and tender.

• Nipples may stick out more.

• You may need to urinate more often.

• You may feel tired.

• You may feel nauseated and even vomit.

• You may crave certain foods or lose your appetite.

• You may have heartburn or indigestion.

• You may be constipated.

• You may gain or lose a few pounds.

Baby:

First month:(1/2 inch, less than 1 ounce)

• The fertilized egg attaches to the lining of the uterus. Some of these cells will grow into a baby; others will form the placenta.

• Arms and legs begin to form.

• Brain and spinal cord begin to form.

• Heart and lungs begin to develop. The heart begins to beat near the end of the month.

Second month:(1 inch, less than 1 ounce)

• Eyelids form, but remain closed.

• Inner ear begins to develop.

• Bones appear.

• Ankles, wrists, fingers and toes form.

• Genitals begin to develop.

• By the end of the month, all major organs and body systems have begun to develop.

Third month:(3-1/2 inches, just more than 1 ounce)

• Twenty buds for future teeth appear.

• All internal parts are formed, but are not fully developed.

• Fingers and toes continue to grow. Soft nails begin to form.

• Bones and muscles begin to grow.

• Intestines begin to form.

• Backbone is soft and can flex.

• Skin is almost transparent.

• Hands are more developed than the feet.

• Arms are longer than the legs.

Mother:

• Appetite increases; nausea and fatigue might ease.

• Abdomen begins to expand. By the end of this trimester, the top of your uterus will be near your rib cage.

• Skin on your abdomen and breasts stretches and may feel tight and itchy. You might see stretch marks.

• Abdomen may ache on one side or the other, as ligaments that support your uterus are stretched.

• A dark line, the linea nigra, may appear down the middle of your stomach from your navel to your pubic hair.

• You might get brown patches (chloasma, or the "mask of pregnancy") on your face.

• Areolas, the darker skin around your nipples, might darken.

• Feet and ankles might swell.

• You might feel your uterus in your lower abdomen.

Baby:

Fourth month:(6-7 inches, 5 ounces)

• Eyebrows, eyelashes and fingernails form.

• Arms and legs can flex.

• External sex organs are formed.

• Skin is wrinkled and the body is covered with a waxy coating (vernix) and fine hair (lanugo).

• Placenta is fully formed.

• Outer ear begins to develop.

• The fetus can swallow.

• Neck is formed.

• Kidneys are functioning and begin to produce urine.

Fifth month:(10 inches, 1/2-1 pound)

• The sucking reflex develops. If the hand floats to the mouth, the fetus may suck his or her thumb.

• Fetus is more active. You may be able to feel him or her move.

• The fetus sleeps and wakes regularly.

• Nails grow to the tips of the fingers.

• Gall bladder begins producing bile, which is needed to digest nutrients

• In a girl, all her eggs have formed in her ovaries.

• In a boy, testicles begin to descend from the abdomen into the scrotum.

Sixth month:(12 inches, 1-1-1/2 pounds)

• Real hair begins to grow.

• Brain is rapidly developing.

• Eyes begin to open.

• Finger and toe prints can be seen.

• Lungs are fully formed, but not yet functioning.

Mother:

• You can feel the baby's movements strongly.

• You may be short of breath.

• You need to urinate more often as the baby drops and puts extra pressure on your bladder.

• Colostrum -- a yellow, watery pre-milk -- might leak from your nipples.

• Navel might stick out.

• You might have contractions (abdominal tightening or pain). These can signal false or real labor.

Baby:

Seventh month:(14 inches, 2-2-1/2 pounds)

• Eyes can open and close and sense changes in light.

• Lanugo starts disappearing.

• Fetus kicks and stretches.

• Fetus can make grasping motions and responds to sound.

Eighth month:(18 inches, 5 pounds)

• With major development finished, fetus gains weight very quickly.

• Bones harden, but the sutures of the skull remain open allowing the skull to fit through the vagina during delivery.

• Different regions of the brain are forming.

• Taste bids develop; fetal taste buds respond to the stimulus of sweet and sour.

• Fetus might hiccup.

Ninth month:(20 inches, 6-9 pounds)

• Fetus usually turns into a head-down position.

• Skin is less wrinkled.

• Lungs mature and are ready to function on their own.

• Sleeping patterns develop.

• Fetus gains about 1/2 pound per week.