How Big is Baby

How big is baby? Click through our fruit and veggie fetal development chart to find out. Learn what’s going on with baby inside the womb during every week of your pregnancy. We’ll tell you how big baby is, what’s happening with fetal development and what to expect for yourself. Now, here’s a quick preview of the average fetal development: Baby starts out as a little zygote the size of a poppyseed, but by week 6 is closer to a sweet pea, with blood starting to circulate. At week 8, your little one resembles a raspberry -- in size, at least -- with little arms and legs starting to move. During week 10, your prune’s arm joints will start to work, in week 13, your little peach’s teeth and vocal cords should appear, and in week 16, your avocado’s eyebrows, eyelashes, and hair will fill in. Your banana will have working taste buds in week 21, and by month 7, your squash’s sleeping and waking cycles will start establishing. Finally, in month 9, your full-term watermelon -- by now a totally developed baby -- will be just about ready to pop…and we have a feeling you’ll be more than ready.

More about baby's development Less about baby's development

baby registry

need to buy a gift?

Find baby registries (at top retailers!) and websites with one easy search.

How Big Is Baby?





your baby, week-by-week

Weeks 3 & 4: Poppyseed

Right now your little zygote is settling into your uterus...

More on what baby's up to >>

Week 5: Appleseed

Average size: .13 inches**
Baby's major organs and systems are now forming...

More on what baby's up to >>

Week 6: Sweet Pea

Average size: .25 inches
Blood is starting to circulate...

More on what baby's up to >>

Week 7: Blueberry

Average size: .51 inches
Baby's brain is growing fast...

More on what baby's up to >>

Week 8: Raspberry

Average size: .63 inches, .04 oz.
Those little arms and little legs are moving like crazy...

More on what baby's up to >>

Week 9: Green Olive

Average size: .9 inches, .07 oz.
A Doppler device might pick up a heartbeat this week...

More on what baby's up to >>

Week 10: Prune

Average size: 1.2 inches, .14 oz.
Baby's arm joints are working, and soon the legs will too...

More on what baby's up to >>

Week 11: Lime

Average size: 1.6 inches, .25 oz.
Fingers and toes are no longer webbed...

More on what baby's up to >>

Week 12: Plum

Average size: 2.1 inches, .49 oz.
Almost all vital systems are fully formed...

More on what baby's up to >>

Week 13: Peach

Average size: 2.9 inches, .81 oz.
Teeth and vocal cords are appearing...

More on what baby's up to >>

Week 14: Lemon

Average size: 3.4 inches, 1.5 oz.
Liver, kidney, and spleen are continuing to develop...

More on what baby's up to >>

Week 15: Navel Orange

Average size: 4 inches, 2.5 oz.

Legs are finally longer than arms...
More on what baby's up to
>>

Week 16: Avocado

Average size: 4.6 inches, 3.5 oz.
Eyebrows, lashes, and hair are filling in...

More on what baby's up to >>

Week 17: Onion

Average size: 5.1 inches, 5.9 oz.
Skeleton is hardening, and fat is accumulating...

More on what baby's up to >>

Week 18: Sweet Potato

Average size: 5.6 inches, 6.7 oz.
Baby's moving like crazy -- feel anything yet?

More on what baby's up to >>

Week 19: Mango

Average size: 6.0 inches, 8.5 oz.
Vermix caseosa is coating baby's skin...

More on what baby's up to >>

Week 20: Banana

Average size: 6.5 inches, 10.6 oz.
Boy or girl, genitals are fully formed...

More on what baby's up to >>

Week 21: Pomegranate

Average size: 10.5 inches ***, 12.7 oz.
Taste buds are starting to work...

More on what baby's up to >>

Week 22: Papaya

Average size: 10.5 inches ***, 12.7 oz.
Baby's on a sleep cycle -- about 12 to 14 hours a day

More on what baby's up to >>

Week 23: Grapefruit

Average size: 10.5 inches ***, 12.7 oz.
Baby’s listening to your voice and heartbeat in there…

More on what baby's up to >>

Week 24: Canteloupe

Average size: 10.5 inches ***, 12.7 oz.
Nipples are sprouting, and face is fully formed!

More on what baby's up to >>

Week 25: Cauliflower

Average size: 13.6-14.8 inches, 1.5-2.2 lb.
Baby knows which way is up and which is down now…

More on what baby's up to >>

Week 26: Lettuce

Average size: 13.6-14.8 inches, 1.5-2.2 lb.
Eyes are forming and will soon start to open

More on what baby's up to >>

Week 27: Rutabaga

Average size: 13.6-14.8 inches, 1.5-2.2 lb.
Baby’s showing brain activity…

More on what baby's up to >>

Week 28: Eggplant

Average size: 13.6 -14.8 inches, 1.5-2.2 lb.
Immune system is preparing for the outside world...

More on what baby's up to >>

Week 29: Acorn Squash

Average size: 15.2-16.7 inches, 2.5-3.8 lb.
Baby’s hiccupping in there…

More on what baby's up to >>

Week 30: Cucumber

Average size: 15.2 -16.7 inches, 2.5-3.8 lb.
Baby’s strong enough to grasp a finger now.

More on what baby's up to >>

Week 31: Pineapple

Average size: 15.2-16.7 inches, 2.5-3.8 lb.
All five of the senses are working…

More on what baby's up to >>

Week 32: Squash

Average size: 15.2- 16.7 inches, 2.5-3.8 lb.
Sleeping and waking cycles are establishing...

More on what baby's up to >>

Week 33: Durian Fruit

Average size: 17.2-18.7 inches, 4.2-5.8 lb.
Bones are hardening…

More on what baby's up to >>

Week 34: Butternut Squash

Average size: 17.2-18.7 inches, 4.2-5.8 lb.
Baby can recognize and react to simple songs

More on what baby's up to >>

Week 35: Coconut

Average size: 17.2-18.7 inches, 4.2-5.8 lb.
Hearing is fully developed…

More on what baby's up to >>

Week 36: Honeydew

Average size: 17.2-18.7 inches, 4.2-5.8 lb.
Hearing is fully developed…

More on what baby's up to >>

Week 37: Winter melon

Average size: 18.9-20.9 inches, 6.2-9.2 lb.
Baby’s inhaling, exhaling, sucking, gripping and blinking.

More on what baby's up to >>

Week 38: Pumpkin

Average size: 18.9-20.9 inches, 6.2-9.2 lb.
Baby might have an inch or so of hair already.

More on what baby's up to >>

Week 39: Watermelon

Average size: 18.9-20.9 inches, 6.2-9.2 lb.
Baby’s flexing his limbs in there.

More on what baby's up to >>

Week 40: Jackfruit

Average size: 18.9-20.9 inches, 6.2-9.2 lb.
Full term! Baby's finally ready for the outside world...

More on what baby's up to >>

*Pregnancy weeks are counted from the last menstrual period.
**From week 5-20, measurements are taken from crown to rump.
***From week 21 on, measurements are taken from head to toe.

-- The Bump Editors

See More: 1st Trimester , 2nd Trimester , 3rd Trimester