The Second Trimester
Prenatal visits during the second trimester
During the second and third trimester prenatal visits, your health care
provider may check the following, depending on your current medical condition
and the health of the fetus:
Any current symptoms or discomforts
Mother's blood pressure
Urine test to detect albumin (a protein) which may indicate preeclampsia
or toxemia, and sugar (which may indicate hyperglycemia)
Growth, size, and development of the fetus
Size of the uterus (after approximately 12 weeks of gestation, the uterus
can be felt through the abdominal wall)
Height of the fundus (top of the uterus), starting at 20 weeks of gestation
What to expect during the second trimester
The second trimester marks a turning point for mother and fetus. The mother
usually begins to feel better and will start showing the pregnancy more.
The fetus has now developed all its organs and systems, and will now focus
on growing in size and weight.
During the second trimester, the umbilical cord continues to thicken as
it carries nourishment to the fetus. However, harmful substances also
pass through the umbilical cord to the fetus, so care should be taken
to avoid alcohol, tobacco, and other known hazards.
During the second trimester, both the mother's body and the fetus continue to grow.
Fetal development during the second trimester
Now that all the major organs and systems have formed in the fetus, the
following six months will be spent growing. The weight of the fetus will
multiply more than seven times over the next few months, as the fetus
becomes a baby that can survive outside of the uterus.
By the end of the second trimester, the fetus will be about 13 to 16 inches
long and weighs about 2 to 3 pounds. Fetal development during the second
trimester includes the following:
The fetus kicks, moves, and can turn from side to side.
The eyes have been gradually moving to the front of the face and the ears
have moved from the neck to the sides of the head. The fetus can hear
the mother's voice.
A creamy white substance (called vernix caseosa, or simply vernix) begins
to appear on the fetus and helps to protect the thin fetal skin. Vernix
is gradually absorbed by the skin, but some may be seen on babies even
The fetus is developing reflexes such as swallowing and sucking.
The fetus can respond to certain stimuli.
The placenta is fully developed.
The brain will undergo its most important period of growth from the 5th month on.
Fingernails have grown on the tips of the fingers and toes, and the fingers
and toes are fully separated.
The fetus goes through cycles of sleep and wakefulness.
Skin is wrinkly and red, covered with soft, downy hair (called lanugo).
Hair is growing on the head of the fetus.
Fat begins to form on the fetus.
Eyelids are beginning to open and the eyebrows and eyelashes are visible.
Fingerprints and toeprints have formed.
Rapid growth is continuing in fetal size and weight.
The 20th week marks the halfway point of the pregnancy.
A fetus born at the end of 24 weeks may survive in a neonatal intensive
care unit (NICU).
Changes in the mother's body
The second trimester is the most physically enjoyable for most women. Morning
sickness usually abates by this time and the extreme fatigue and breast
tenderness usually subsides. These changes can be attributed to a decrease
in levels of human chorionic gonadotropin (hCG) hormone and an adjustment
to the levels of estrogen and progesterone hormones.
The following is a list of changes and symptoms that may occur during the
Appetite may increase.
The mother may be able to feel the movement of the fetus for the first
time - a phenomenon called quickening - by 20 weeks.
The uterus has grown to the height of the belly button, making the pregnancy visible.
The skin on the belly may itch as it grows and there may be pain down the
sides of the body as the uterus stretches. The lower abdomen may ache
as ligaments stretch to support the uterus.
The need to frequently urinate may decrease as the uterus grows out of
the pelvic cavity, relieving pressure on the bladder.
A mother's nose may become congested and she may experience nosebleeds.
This is due to the increase in hormones (estrogen and progesterone) that
affect the mucous membranes in the nose.
A woman's gums become more spongy and may bleed easily. This is due
to the increase in hormones (estrogen and progesterone) that affect the
mucous membranes in the mouth.
Varicose veins and hemorrhoids may appear.
A woman may have a white-colored vaginal discharge called leukorrhea. (A
colored or bloody discharge may signal possible complications and should
be examined immediately.)
The increasing weight gain may cause backaches.
Skin pigmentation may change on the face or abdomen due to the pregnancy hormones.
Heart burn, indigestion, and constipation may continue.