Weekly Development of Baby’s Size During Pregnancy

The size of a baby can vary week by week during pregnancy. Here is a general overview of the average fetal size during each trimester:

First Trimester:

  • Week 4: The embryo is about the size of a poppy seed.
  • Week 8: The fetus is around 0.6 to 0.7 inches (1.6 to 1.8 centimeters) long, about the size of a raspberry.

Second Trimester:

  • Week 12: The fetus is approximately 2.5 to 3 inches (6.4 to 7.6 centimeters) long, similar to the size of a lime.
  • Week 16: The fetus measures about 4.6 to 4.8 inches (11.7 to 12.2 centimeters) long, comparable to the size of an avocado.
  • Week 20: The fetus grows to about 6.5 to 7.5 inches (16.5 to 19.1 centimeters) long, approximately the size of a banana.
  • Week 24: The fetus measures around 10.5 to 11.8 inches (26.7 to 30 centimeters) long, similar to the size of an ear of corn.

Third Trimester:

  • Week 28: The fetus is about 13.6 to 14.8 inches (34.6 to 37.6 centimeters) long, roughly the size of an eggplant.
  • Week 32: The fetus grows to approximately 15.2 to 16.7 inches (38.6 to 42.4 centimeters) long, comparable to the size of a squash.
  • Week 36: The fetus measures around 17.2 to 18.7 inches (43.6 to 47.4 centimeters) long, similar to the size of a honeydew melon.
  • Week 40 (full-term): The average baby is about 19 to 21 inches (48 to 53 centimeters) long and weighs around 6 to 9 pounds (2.7 to 4 kilograms), similar to the size of a small watermelon.

It’s important to note that these sizes are approximate averages and can vary from baby to baby. Consult with a healthcare professional for more accurate and personalized information about fetal development during pregnancy.

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