🔔 Enable notifications

Receive important alerts about your pregnancy

week 13
Illustration of baby development at week 13 of pregnancy

New Trimester, New Developments: Your Baby in the Thirteenth Week of Pregnancy

Updated on

  • Baby size 7.4 cm
  • Approximate weight 23 g
  • About the size of a pea pod

By the 13th week of pregnancy, your baby has entered the second trimester and continues to grow rapidly. The baby is approximately 7-8 cm and weighs about 23 grams. Internal organs, such as the liver and pancreas, begin to function and the vocal cords are developing. Unique fingerprints begin to form and bones continue to harden. The baby now has reflexes and can move his arms and legs. This is an exciting time where every day he brings new advances and developments.

Share

The images and descriptions of the baby's development from week 1 to week 42 have been generated using artificial intelligence. Although they offer a close representation, they are not 100% accurate. For exact, personalized information about your baby's development, we recommend getting an ultrasound and consulting your doctor.

This content is for educational purposes and does not replace medical advice. Sizes and weights are reference averages and vary in every pregnancy. If you notice any warning sign, seek medical care immediately.