Week 31 of Pregnancy: Baby’s Increasing Fat Layers and Maternal Milestones

Baby Size at Week 31: At week 31, your baby is approximately the size of a coconut, measuring around 16.7 inches (42.4 centimeters) from head to heel. The baby’s weight is about 3.3 pounds (1.5 kilograms). The baby’s fat layers are increasing, helping to regulate body temperature and providing energy stores.

Changes and State in the Mother’s Body:

  • Your uterus is now about 4.5 to 5.5 inches (11.4 to 14 centimeters) above your belly button.
  • You may experience shortness of breath and feel increased pressure on your diaphragm as the baby grows and takes up more space.
  • Your breasts may continue to increase in size and prepare for breastfeeding, with some women experiencing leaking colostrum, a yellowish fluid.
  • You might notice increased vaginal discharge due to hormonal changes and the body’s natural cleaning process.
  • Some women may experience lower back pain or pelvic discomfort as the ligaments and joints prepare for childbirth.

Common Symptoms:

  • Heartburn and indigestion
  • Frequent urination
  • Swollen ankles and feet
  • Braxton Hicks contractions
  • Trouble sleeping

Tips for Week 31:

  1. Eat smaller, more frequent meals and avoid spicy or greasy foods to manage heartburn and indigestion.
  2. Empty your bladder completely each time you urinate to minimize frequent urination. Avoid drinking excessive fluids before bedtime.
  3. Elevate your feet and wear comfortable shoes to reduce swelling in your ankles and feet. Avoid sitting or standing for long periods.
  4. Practice gentle exercises or stretches to relieve lower back pain and pelvic discomfort. Consider prenatal yoga or swimming for added relief.
  5. Invest in a pregnancy pillow or use supportive pillows to find a comfortable sleeping position. Avoid consuming caffeine in the evening to improve sleep quality.


  1. Why am I experiencing increased heartburn and indigestion at week 31 of pregnancy?
    • Hormonal changes during pregnancy can relax the muscles that control the opening between the stomach and esophagus, leading to increased heartburn and indigestion. Eating smaller meals, avoiding trigger foods, and sitting upright after eating can help alleviate these symptoms.
  2. Is it normal to have swollen ankles and feet during week 31 of pregnancy?
    • Yes, swelling in the ankles and feet, known as edema, is common during pregnancy due to increased fluid retention and pressure on blood vessels. Elevating your feet, avoiding prolonged standing or sitting, and wearing comfortable shoes can help reduce swelling.
  3. What exercises can I do to relieve lower back pain and pelvic discomfort at week 31 of pregnancy?
    • Gentle exercises like prenatal yoga, swimming, and pelvic tilts can help alleviate lower back pain and pelvic discomfort. Consult with a healthcare provider or certified prenatal fitness instructor for personalized recommendations and modifications.

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