3 min read
EFNEP from Seed to Melon; Little girl listening to pregnant mother's abdomen

Have you ever wondered how big or small a baby is during pregnancy? Get a sense of baby’s size with these week-by-week averages. These are only approximate sizes. Healthy babies come in all different sizes!

Sizes by Weeks

  • Week 4: Baby is the size of a seed from a kiwifruit, practically microscopic.
  • Week 5: Baby is the size of an apple seed, measuring less than 1/4 inch long.
  • Week 6: Baby is the size of one pea in a sweet pea, measuring around 1/3 inch long.
  • Week 7: Baby is the size of a blueberry, measuring around 1/2 inch long.
  • Week 8: Baby is the size of a grape, measuring around 2/3 inch long.
  • Week 9: Baby is the size of a fig, measuring around 3/4 inch long.
  • Week 10: Baby is the size of a strawberry, measuring around 1 1/4 inches long and weighing around 1/4 ounce.
  • Week 11: Baby is the size of a lime, measuring around 2 inches long and weighing around 1/3 ounce.
  • Week 12: Baby is as long as a baby carrot, measuring around 2 1/2 inches long and weighing around 1/2 ounce.
  • Week 13: Baby is the size of a lemon, measuring around 2 3/4 inches long and weighing around 3/4 ounce.
  • Week 14: Baby is the size of a peach, measuring around 3 1/2 inches long and weighing around 1 1/2 ounces.
  • Week 15: Baby is the size of an apple, measuring around 4 inches long and weighing around 2 1/3 ounces.
  • Week 16: Baby is the size of an avocado, measuring around 4 1/2 inches long and weighing around 3 1/3 ounces.
  • Week 17: Baby is the size of a tomato, measuring around 5 inches long and weighing around 5 1/2 ounces.
  • Week 18: Baby is the size of a bell pepper, measuring around 5 1/2 inches long and weighing around 7 ounces.
  • Week 19: Baby is the size of a mango, measuring around 6 inches long and weighing around 8 ounces.
  • Week 20: Baby is the size of a sweet potato, measuring around 6 1/3 inches long and weighing around 10 ounces.
  • Week 21: Baby is the size of a pomegranate, measuring around 11 inches long and weighing around 12 1/2 ounces.
  • Week 22: Baby is as long as a carrot, measuring around 11 inches and weighing around 1 pound.
  • Week 23: Baby is the size of a yellow squash, measuring around 11 1/4 inches long and weighing around 1 1/4 pounds.
  • Week 24: Baby is as long as an ear of corn, measuring around 11 3/4 inches long and weighing around 1 1/3 pounds.
  • Week 25: Baby is the size of a rutabaga, measuring around 13 1/2 inches long and weighing around 1 1/2 pounds.
  • Week 26: Baby is the size of a head of lettuce, measuring around 14 inches long and weighing around 1 3/4 pounds.
  • Week 27: Baby is the size of an acorn squash, measuring around 14 1/4 inches long and weighing around 2 pounds.
  • Week 28: Baby is the size of a head of cauliflower, measuring around 14 3/4 inches long and weighing around 2 1/2 pounds.
  • Week 29: Baby is the size of an eggplant, measuring around 15 inches long and weighing around 2 1/2 pounds.
  • Week 30: Baby is the size of a coconut, measuring around 15 3/4 inches long and weighing around 3 pounds.
  • Week 31: Baby is the size of a cabbage, measuring around 16 1/4 inches long and weighing around 3 1/3 pounds.
  • Week 32: Baby is the size of a pineapple, measuring around 16 3/4 inches long and weighing around 3 1/3 pounds.
  • Week 33: Baby is the size of a solo papaya, measuring around 17 1/4 inches long and weighing around 4 1/4 pounds.
  • Week 34: Baby is the size of a butternut squash, measuring around 17 3/4 inches long and weighing around 4 3/4 pounds.
  • Week 35: Baby is the size of a cantaloupe, measuring around 18 1/4 inches long and weighing around 5 1/4 pounds.
  • Week 36: Baby is as long as a leek, measuring around 18 1/2 inches long and weighing around 5 3/4 pounds.
  • Week 37: Baby is the size of a honeydew melon, measuring around 19 1/4 inches long and weighing around 6 1/3 pounds.
  • Week 38: Baby is the size of a seedless melon, measuring around 19 1/2 inches long and weighing around 6 3/4 pounds.
  • Week 39: Baby is the size of a pumpkin, measuring around 19 3/4 inches long and weighing around 7 1/4 pounds.
  • Week 40: Baby is the size of a watermelon, measuring around 18 to 20 inches long and weighing around 6 to 8 pounds.

This is part of the Today’s Mom program of Alabama EFNEP.

Did you find this helpful?