How accurate are these fruit and object size comparisons for baby size by week?

These comparisons are illustrative and provide a relatable way to visualize your baby's approximate size. Actual fetal size can vary based on genetics, mother's health, and other factors. Ultrasounds provide more precise measurements.

What factors can affect my baby's size during pregnancy?

Several factors influence fetal size, including genetics (parents' height and weight), mother's nutrition and overall health, number of babies (twins, triplets), and conditions like gestational diabetes.

How is gestational age different from fetal age?

Gestational age is counted from the first day of your last menstrual period (LMP), typically about two weeks before actual conception. Fetal age is the actual age of the baby from conception. Most pregnancy tracking uses gestational age.

Can I track my baby's exact size with this gestational growth chart?

This guide provides average sizes for fetal development week by week. For precise measurements of your baby, your healthcare provider will use ultrasound examinations.

Gestational Size Guide: See How Your Baby Grows Week by Week

Ever wondered how big your developing baby is? Our baby size by week guide uses fun, relatable comparisons to fruits, vegetables, and everyday objects to help you visualize your baby’s growth from week 4 to 40.

Why Visualize Your Baby's Size?

Tracking fetal development week by week is an exciting part of pregnancy. While medical measurements like length and weight are precise, comparing your baby's size to familiar objects can make the journey more tangible and fun. This pregnancy size guide helps you connect with your baby's growth in a unique way.

First Trimester (Weeks 4-13)

Second Trimester (Weeks 14-27)

Third Trimester (Weeks 28-40)

Frequently Asked Questions

How This Guide Works

This baby size by week uses average fetal growth data typically found in medical literature. Each week, we provide an approximate length and weight. To make these numbers more relatable, we compare the baby's general size to common fruits, vegetables, or objects.

Remember, every pregnancy is unique, and these are just general guidelines to help you visualize your baby's amazing journey!

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InstantAgeCalculator offers a variety of tools to help you navigate dates, times, and important life milestones.

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Why Visualize Your Baby's Size?

First Trimester (Weeks 4-13)

Week 4: About the size of a poppy seed

Week 5: About the size of a sesame seed

Week 6: About the size of a lentil or a small pea

Week 7: About the size of a blueberry

Week 8: About the size of a kidney bean or a raspberry

Week 9: About the size of a cherry or a grape

Week 10: About the size of a prune or a kumquat

Week 11: About the size of a lime or a fig

Week 12: About the size of a plum

Week 13: About the size of a peach or a pea pod

Second Trimester (Weeks 14-27)

Week 14: About the size of a lemon

Week 15: About the size of an apple or a navel orange

Week 16: About the size of an avocado

Week 17: About the size of a pear or a large onion

Week 18: About the size of a bell pepper or a sweet potato

Week 19: About the size of a large mango or an heirloom tomato

Week 20: About the size of a small cantaloupe or a banana

Week 21: About the size of a large banana or a pomegranate

Week 22: About the size of a papaya or a spaghetti squash

Week 23: About the size of a large grapefruit or a small eggplant

Week 24: About the size of an ear of corn or a large zucchini

Week 25: About the size of a rutabaga or an acorn squash

Week 26: About the size of a head of lettuce or a bunch of kale

Week 27: About the size of a head of cauliflower

Third Trimester (Weeks 28-40)

Week 28: About the size of a large eggplant or a Chinese cabbage

Week 29: About the size of a butternut squash

Week 30: About the size of a large cabbage or a cucumber

Week 31: About the size of a coconut or a large cucumber

Week 32: About the size of a jicama or a Napa cabbage

Week 33: About the size of a pineapple or a celery root

Week 34: About the size of a cantaloupe (small-medium)

Week 35: About the size of a honeydew melon

Week 36: About the size of a large cantaloupe or a head of romaine lettuce

Week 37: About the size of a Swiss chard or a winter melon

Week 38: About the size of a bundle of leeks or a rhubarb stalk

Week 39: About the size of a mini watermelon or a small pumpkin

Week 40: About the size of a small pumpkin or a watermelon