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How Big Is My Baby?

A Week-by-Week Fetus-Size Guide Based on Objects You Actually Know

This week the fetus growing inside of me is a big as a cauliflower! But does that mean a piece of cauliflower or a full head? Full head, you say? Well, last time I looked at the grocery store, the size of a full head of cauliflower can vary. Don't get me wrong: pregnancy apps that compare a fetus to fruits and vegetables get me through the slog of pregnancy by helping mark each week. But they also leave me scratching my head. Take the one list that told me the baby was now the size of a "cute vintage wallet." Is that smaller or larger than an ugly vintage wallet?

To help out curious parents-to-be like me, I decided to research how the length of a fetus compares to the everyday objects I come in contact with. I tried to choose things with more standard sizes. For weeks 1-19, the size correlates to the length of the baby from crown the rump. After week 20, I used the crown to heel size. Of course, growing babies are all squished up in there and differ in weight from these objects. But assuming I make it to week 40, I'll take it as a badge of honour (or horror) that my baby is about the same length as a standard carry-on bag.

Image Source: Stocksnap / Pixabay

Week 4: a Grain of Sand

Wait — what happened to weeks one, two, and three of the pregnancy? Trick question! You're not actually pregnant during weeks one and two (those are freebies, since we start counting on the first day of your last period). At week three, conception probably just occurred and the fertilized egg is implanting

By week four, your baby, or more accurately your little collection of cells, is 0.07 inches, or about the size of a grain of sand. So cute!

Image Source: Stocksnap / Negative Space

Week 5: a Sesame Seed

At just 0.13 inches your fetus resembles the size of the sesame seeds sitting a top the inevitable bagels or burgers you will have while pregnant.

Image Source: Stocksnap / Pexels

Week 7: an Eyelash

Make a wish! This week the fetus has doubled to 0.51 inches, about the length of a human eyelash.

Image Source: Stocksnap / Pexels

Week 8: a Gummy Bear

At 0.63 inches your baby's length is about the same as a gummy bear's height. Don't you just want to squeeze them!

Image Source: Stocksnap / Pexels

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Week 9: the Return Key on Your Laptop

Anytime you press "enter" note that your baby's length (0.90 inches) is about the same size as that key.

Image Source: POPSUGAR Photography / Mark Popovich

Week 10: a Nespresso Capsule

These pods of caffeine have a height similar to your baby, who is 1.22 inches long this week.

Image Source: Flickr user Nick Harris

Week 11: a Cork

You won't have any chances to pop open some wine this week, but if you did, your baby would be around the size as the cork, about 1.61 inches.

Image Source: Stocksnap / Pexels

Week 12: a McDonald's French Fry

Pregnancy cravings got you wanting junk food? Run out and grab some McDonald's French fries, which are roughly 2.13 inches long, the same length of your baby this week.

Image Source: Flickr user mxmstryo

Week 13: Lipstick

Each time you apply your lipstick, note that the tube is about the same length as the little one in your womb, 2.91 inches.

Image Source: POPSUGAR Photography / Mark Popovich

Week 14: Credit Card

Open your wallet, and you'll see a good approximation of how long your baby is: 3.42 inches.

Image Source: POPSUGAR Photography / Mark Popovich

Week 15: a Pint of Ice Cream

Your baby is as long as a Ben & Jerry's pint is tall: 3.98 inches. That sounds good right about now, doesn't it?

Image Source: Flickr user Ginny

Week 16: a Can of Coke

While not the healthiest part of a pregnancy diet, a can of Coke is about the same size as your fetus, 4.57 inches.

Image Source: Flickr user Ryan Fung

Week 17: Mascara

Your baby is a long way from the size of an eyelash and has now graduated to about the length of a mascara tube, 5.12 inches.

Image Source: POPSUGAR Photography / Benjamin Stone

Week 18: iPhone 7

Take a good look at your iPhone 7. You have a fetus about as long (5.59 inches)!

Image Source: POPSUGAR Photography / Paul Kabat

Week 19: a Starbucks Venti Iced Coffee

At 6.02 inches, your baby is now the size of a venti iced coffee from Starbucks, which has way more caffeine than you can handle at the moment.

Image Source: Flickr user Chandler Thompson

Week 20: a Tall Water Bottle

Stay hydrated, and remember that this week, your baby is as long as a tall water bottle at 10.08 inches.

Image Source: POPSUGAR Photography / Kat Borchart

Week 21: a Magazine

There won't be much time to read once you welcome your baby, who is 10.51 inches long.

Image Source: POPSUGAR Photography / Mark Popovich

Week 22: a Roll of Paper Towels

That roll of paper towels sitting on your kitchen counter is the same length as your baby now, 10.94 inches.

Image Source: Flickr user J. Ott

Week 23: a Box of Rice-A-Roni

A box of the San Francisco treat is approximately the size of the other treat in your belly, 11.38 inches.

Image Source: Flickr user david jones

Week 24: a Bottle of Wine

That bottle of wine you're wistfully eyeing? It's about as tall as your baby is long, 11.81 inches.

Image Source: POPSUGAR Photography / Mark Popovich

Week 25: a Bottle of Champagne

Have a nice bottle of champagne you're saving to celebrate childbirth in a few months? It's about as tall as your baby, 13.62 inches.

Image Source: POPSUGAR Photography / Jae Payne

Week 26: a Curling Wand

If you're adding waves to your hair this week (congrats for still trying!) — you're holding a wand about the size of your baby, 14.02 inches.

Image Source: POPSUGAR Photography / Annie Gabillet

Week 27: a Party-Size Bag of Chips

While you might want one all for yourself, this oversize bag of chips is the same length as your little one this week, who measures 14.41 inches.

Image Source: POPSUGAR Photography / Annie Gabillet

Weeks 28: a Handle of Vodka

At this point your baby is 14.8 inches, similar to a handle of vodka, which you won't be enjoying anytime soon.

Image Source: POPSUGAR Photography / Annie Gabillet

Week 29: a Loaf of Bread

Your baby measures 15.2 inches this week, about the length of a good old loaf of store-bought bread.

Image Source: Flickr user Phillip Pressar

Week 30: a Box of Cereal

15.71 inches is about the size of your baby and a box of cereal, a potential pregnancy craving.

Image Source: Flickr user Mike Mozart

Week 31: a Serving Tray

Your baby is measuring 16.18 inches now, approximately the size of a serving tray. (Side note: how good do those donuts look?)

Image Source: POPSUGAR Photography / Sheila Gim

Week 32: a Box For an Extra-Large Pizza

Mmmm . . . pizza. If you're ordering an extra large this week (which, you should), know the box is about the same length as your little one, 16.69 inches.

Image Source: Stocksnap / Pexels

Week 33: a Paper Grocery Bag

At 17.2 inches, your baby is about as long as a paper grocery bag is tall.

Image Source: POPSUGAR Photography / Annie Gabillet

Week 34: a Full-Size Keyboard

Your baby's getting long — 17.70 inches, or the same length as a keyboard.

Image Source: Stocksnap /Pexels

Week 35: a Throw Pillow

A standard throw pillow is approximately the same size as your almost-here baby, 18.19 inches. Practice cuddling on the couch!

Image Source: POPSUGAR Photography

Week 36: a Rolling Pin

At 18.66 inches, your growing baby is about as long as a rolling pin.

Image Source: Flickr user Didriks

Week 37: a Windshield Wiper Blade

Your baby is 19.13 inches long this week — just like a windshield-wiper blade.

Image Source: Stocksnap / Pexels

Week 38: a Herschel Backpack

Your baby is as tall as a Herschel backpack, measuring 19.61 inches. You'll be carrying more than that soon.

Image Source: Stocksnap / Pexels

Week 39: a Microwave

You're about to meet your baby, but it still has some cooking to do. This week, it's about 19.96 inches long, or the length of a microwave.

Image Source: Flickr user Chris Kelly

Week 40: a Carry-on Suitcase

Wow. You've made it to 40 weeks, which means your baby is now about 20.16 inches, approximately the standard height of a carry-on suitcase. I'll let that sink in.

Image Source: Flickr user Stein Magne Bjørklund

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