Your Pregnancy Week by Week: 35-40

Week 35
Baby: Your baby measures about 20.25 inches from head to toe and weighs more than 5.5 pounds. Lungs are almost fully developed, but if born now the baby would probably be put in an incubator. It still doesn't have enough fat deposits beneath its skin to keep warm outside your womb.

Mom-to-be: Your uterus is about six inches above your navel. By now your weight gain is probably between 24 and 29 pounds. Your doctor will test you for Group B streptococcus bacteria between now and 37 weeks. You may be getting more uncomfortable and not sleeping very well. You also may be getting more anxious about the labor and delivery, and you may even be moodier and more irritable.

Tip for the Week: Be sure you've collected the necessary baby clothes, equipment -- especially a car seat -- and furniture to get you through the first few weeks, at least.

Week 36
Baby: Your baby measures about 20.7 inches from head to toe and weighs about 6 pounds. The baby may drop lower in your abdomen, usually assuming the head-down position after having frequently assumed other positions during early pregnancy. The brain has been developing rapidly, and your baby is practicing blinking.

Mom-to-be: Your uterus has grown bigger these last few weeks and is probably up under your ribs. But you're in the home stretch; after this week you'll be seeing your doctor weekly. You may be alternating between fatigue and extra bursts of energy. You may also be experiencing increased backache and heaviness, constipation, heartburn and discomfort in your buttocks and pelvis.

Tip of the Week: Start stocking your freezer with foods that can be easily popped into the oven or microwave after you bring your baby home. Chili, casseroles and many other dishes can be prepared and frozen ahead of time for use later.

Week 37
Baby: Your baby is about 21 inches from head to toe and weighs almost 6.5 pounds. Baby is getting rounder every day, and skin is getting pinker and losing its wrinkly appearance. Baby's head is usually positioned down into the pelvis by now.

Mom-to-be: Your uterus may stay the same size as it was for the last week or two. Your weight gain should be about as high as it will go, about 25 to 35 pounds. About this time, your doctor might perform a pelvic exam to help judge the progress of your pregnancy.

Tip of the Week: Just in case you deliver early, consider packing two bags for the hospital. Pack one bag for you, with warm socks, a robe, lip balm and everything you'll want during labor. Pack the other bag with the newborn items you'll want after your baby is born.

Week 38
Baby: Your baby is about 21 inches from head to toe and weighs about 6.8 pounds. Most of the baby's downy hair, lanugo, and whitish coating, vernix, is disappearing. Your baby is getting its antibodies from you to protect against illness. Baby's growth is slowing, but fat cells under skin get plumper for life outside the womb. Almost ready for birth, your baby would do well if born now.

Mom-to-be: You're probably not getting any bigger, but you may be feeling more uncomfortable. Make sure you have a bag packed. It won't be long now -- 95% of all babies are born within two weeks of their mother's due date.


Tip of the Week: Consider whether you'll circumcise your baby if it's a boy. Circumcision isn't as much a medical issue as a cultural or religious one.

Week 39
Baby: Your baby is about 21.5 inches long from head to toe and weighs a little more than 7 pounds. Toenails and fingernails have grown to tips of toes and fingers. Muscles of your baby's arms and legs are strong, and he's practicing lung movements. Baby's head has dropped into the mother's pelvis if he's head-down, which allows you to breathe a little easier.

Mom-to-be: You're probably feeling quite large and uncomfortable. Your uterus has filled your pelvis and most of your abdomen, pushing everything else out of the way. Your center of gravity has shifted, so you may be clumsier than usual.

Tip of the Week: Watch for signs of labor, but don't get too obsessed. It could happen soon or still be weeks away. Some differences between false labor and contractions: False labor pains usually concentrate in the lower abdomen and groin, while true labor pains may start in the lower back and may spread through the entire abdomen. Real labor also becomes stronger and more powerful as time passes.

Week 40
Baby: Your baby's length is about 21.5 inches from head to toe and it weighs about 7.5 pounds. Boys often tend to weigh a little more than girls. Reflexes are coordinated so the baby can blink, close his eyes, turn his head, grasp firmly and respond to sounds, light and touch. More lanugo falls out, but some may remain at birth on shoulders, folds of skin and backs of ears.

Mom-to-be: Birth should be soon now, but don't worry if your due date comes and goes. Only 5% of all babies are born exactly on the due date. It may be more difficult for you to get a good night's sleep because it's hard to find a comfortable position, but try to rest as much as possible, with your feet up if you can.

Tip of the Week: If you think you're in labor, don't eat. Even something light in your stomach can cause nausea.

What's Happening Inside You?
Your baby continues to grow and mature: the lungs are nearly fully developed. Your baby's reflexes are coordinated so he or she can blink, close the eyes, turn the head, grasp firmly, and respond to sounds, light and touch

You should still feel movement every day. Your baby's position changes to prepare itself for labor and delivery. The baby drops down in your pelvis, and usually his or her head is facing down toward the birth canal.

By the end of this month, your baby is about 18 to 20 inches long and weighs about 7 pounds.

Reviewed by The Cleveland Clinic Birthing Services and the Department of Obstetrics and Gynecology.

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