Dads & Dads-to-Be

How Big Is Baby: Dad To Be Edition

In the past, we’ve compared fetal growth to fruits and veggies — but how does baby’s size compare to a baseball? A Rubik’s Cube? A ukulele? We found out.
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Weeks 3 to 4: Stubble

Baby’s still practically microscopic — about the size of that day-old scruff on your chin.

Find out more about baby’s development during weeks 3 and 4 here .

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Week 5: Chocolate Chip

Average size: 0.13 inches

Your baby’s getting a little bigger — about as big as a chocolate chip in a Chips Ahoy! And next week, baby will double in size.

Find out more about baby’s development during week 5  here .

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Week 6: Fishing Sinker

Average size: 0.25 inches

This week, baby is close to a quarter inch long. How big is that? About as big as those tiny split shot sinkers that you’re taking on your next fishing trip.

Find out more about baby’s development during week 6  here .

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Week 7: Cuff Link

Average size: 0.51 inches

Wow! Baby is two times the size he was last week.

Find out more about baby’s development during week 7  here .

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Week 8: Gummy Bear

Average size: 0.63 inches, 0.04 ounces

Your sweet thing is growing about a millimeter each day — isn’t that amazing?

Find out more about baby’s development during week 8  here .

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Week 9: Gumball

Average size: 0.9 inches, 0.07 ounces

Your baby is almost an inch big and now officially qualifies as a fetus, which means, she’s not just a ball of cells, she’s growing organs and other body parts.

Find out more about baby’s development during week 9  here .

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Week 10: Cotton Ball

Average size: 1.2 inches, 0.14 ounces

Baby just keeps on growing — in the next couple of weeks, she’ll nearly double in length.

Find out more about baby’s development during week 10  here .

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Week 11: Golf Ball

Average size: 1.6 inches, 0.25 ounces

Next time you tee off, know your baby’s about as big as the ball. He’s already moving around in your partner’s belly, too. 

Find out more about baby’s development during week 11  here .

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Week 12: Wine Cork

Average size: 2.1 inches, 0.49 ounces

This week, your baby is a little more than two inches in size and weighs almost half an ounce — as big as the cork in a wine bottle.

Find out more about baby’s development during week 12  here .

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Week 13: Espresso Cup

Average size: 2.9 inches, 0.81 ounces

You and your partner have made it to the end of the first trimester, and baby is as big as an espresso cup at the coffeehouse.

Find out more about baby’s development during week 13 here .

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Week 14: Rubik’s Cube

Average size: 3.4 inches, 1.5 ounces

It’s the second trimester and baby is still growing steadily. This week, her weight has almost doubled since last week.

Find out more about baby’s development during week 14  here .

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Week 15: Baseball

Average size: 4 inches, 2.5 ounces

Wow, your baby’s as big as a baseball this week! Soon, he’ll be bigger than your hand.

Find out more about baby’s development during week 15  here .

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Week 16: BlackBerry phone

Average size: 4.6 inches, 3.5 ounces

Yup, now baby’s as big as your cell phone.

Find out more about baby’s development during week 16  here .

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Week 17: Toilet Paper Roll

Average size: 5.1 inches, 5.9 ounces

This week, baby’s as big as that toilet paper roll in your bathroom; your partner might be able to feel him moving around now.

Find out more about baby’s development during week 17  here .

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Week 18: Pint of Ben & Jerry’s

Average size: 5.6 inches, 6.7 ounces

Buying more ice cream these days?  Next time you’re on an errand for a pint of ice cream (or two or more!), just remember it’s about the size of your baby!

Find out more about baby’s development during week 18  here .

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Week 19: Square Tissue Box

Average size: 6 inches, 8.5 ounces

Baby’s getting bigger! Now he’s as big as that tissue box on your nightstand.

Find out more about baby’s development during week 19  here .

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Week 20: Whoopee Cushion

Average size: 6.5 inches, 10.6 ounces

This week, although baby’s as big as a whoopee cushion, she’s definitely heavier than one!

Find out more about baby’s development during week 20  here .

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Week 21: ’80s Fanny Pack

Average size: 10.5 inches, 12.7 ounces

Whoa! Baby grew about 4 inches in one week.

Find out more about baby’s development during week 21  here .

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Weeks 22 to 24: Baseball Mitt

Average size: 10.5 to 11.8 inches, 12.7 to 20.8 ounces

Baby’s now the size of a baseball mitt. How have you been handling all the curveballs involved in being a daddy-to-be?

Find out more about baby’s development during weeks 22 to 24  here .

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Weeks 25 to 28: Lunch Box

Average size: 13.6 inches, 1.5 to 2.2 pounds

At this point, your partner has moved from trimester two to three, and baby’s as big as a kid’s lunch box.

Find out more about baby’s development during weeks 25 to 28  here .

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Weeks 29 to 32: Loaf of Bread

Average size: 15.2 to 16.7 inches, 2.5 to 3.8 pounds

He’s as long as a loaf of sliced bread during these weeks, but definitely not as light!

Find out more about baby’s development during weeks 29 to 32  here .

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Weeks 33-36: Ukulele

Average Size: 17.2 to 18.7 inches, 4.2 to 5.8 pounds

Yup, she’s as big as that mini guitar during these weeks. And she could gain up to an inch in the 33rd week alone.

Find out more about baby’s development during weeks 33 to 36  here .

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Week 37 to Delivery: Beach Ball

Average size: 18.9 to 20.9 inches, 6.2 to 9.2 pounds

You and your partner are in the homestretch! Your baby will be as big as a beach ball from now until your partner’s ready to pop (ahem, deliver).

Find out more about baby’s development during week 37 to delivery  here .

By Sarah Yang