About Your Baby

  • Weeks 25 to 28: Growing and gaining weight rapidly. May suck thumb, hiccup, and stretch from time to time.
  • Weeks 29 to 32: Rapid growth continues, but lungs are still immature.
  • Weeks 33 to 36: Gaining half an ounce of fat every day. Lungs begin to mature.
  • Weeks 37 to 42: Lanugo (downy hair) disappears. Body settles - usually head down - into the pelvis as birth approaches.
  • At the end of this trimester, your baby is about 19 to 21 inches long and weighs about 6 to 9 pounds.

About You

In the third trimester, you’ll probably be aware of the space your baby is taking up inside you. You may notice shortness of breath (the baby presses up into your lungs) and increased urination (the baby presses down on your bladder). You may have trouble sleeping and feel more impatient as the weeks go on and as your anticipation for the baby’s arrival grows.

You’ll probably be alert to the baby’s movement inside of you. In these last few weeks, it’s normal for the baby to move less vigorously there simply isn’t much room to maneuver inside your uterus. Still, if you notice that the baby’s movement has sharply decreased, call your doctor or midwife.

Tips for the 3rd Trimester

  • Do your Kegels. Kegel exercises work the muscles around your vagina. They’re important for helping you push during labor—and also help you regain muscle tone after the birth. To do a Kegel, squeeze the muscles you would use to stop the flow of urine midstream. Hold them tight for a few seconds, then relax. Do this ten times in a row, four or five times a day.
  • Aim for comfort. Prop your feet and legs up whenever you can. Do some back stretches a few times a day. Make time to have warm baths, take naps, or get a massage. Keep up with your exercise, though—you’ll feel better physically and emotionally as you move through these last few weeks.
  • Choose a pediatrician. Unless you have a family practice physician, you need to choose another doctor to care for your baby after birth and throughout childhood. To locate an Intermountain clinician to care for your family’s new addition, visit the Our Doctors section.