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12 Weeks Pregnant – What to Expect Your 12th Week of Pregnancy

Pregnancy author Heidi Murkoff from the best selling What To Expect series tells us what’s happening at 12 weeks of pregnancy.

While it’s hard to believe, your baby has more than doubled in size the past three weeks! He or she is now the size of a plum and has a functioning digestive system.

It’s a landmark week for your little one, since most of his key body systems and vital organs are fully formed by now. Your baby will spend the rest of his gestation bringing those systems up to speed and full maturation so they’ll be able to function to perfection once his big birthday arrives.

Your fetus can now boast the achievement of having more than doubled in size in just three weeks. Crown-to-rump length is about two and a half inches, so he’s about the size of a kiwi, but weighs a lot less, just half an ounce. A fair amount of heft is in that crown: basic brain structure is complete and now it’s time for that brain mass to rapidly increase.

Your baby’s thyroid is now fully formed, the pituitary gland has started producing hormones, and the pancreas has begun to synthesize insulin. Not to be outdone, your baby’s bone marrow is churning out white blood cells, the critical weapons needed to fight infection once your little warrior is on the outside and no longer protected by your immune system.

Muscles in the digestive tract are getting primed, practicing their contractions so they can process food – and lots and lots of poop – after birth. And even though much of the small intestines are still folded up in storage in the umbilical cord, the villi – tiny, finger-like projections that absorb nutrients from food – are now in place.

The best development of all? If you haven’t already heard it, this is the week that your cutie’s heartbeat will come through loud and clear at your checkup. And that’ll be music to your ears.

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cnc3ful
cnc3ful
1 year ago

12 weeks today! On bed rest for a subchorionic hemmorage tho. But I do think it's healing

Pumkin Montana
Pumkin Montana
11 months ago

I’m 12 weeks as of yesterday Im due September 21 congrats to all the other mommy’s !!!

Jannatul Naima
Jannatul Naima
11 months ago

I am 12 weeks and 2 days! Feeling good so far but scared of the thought of labour and caring for a little human being!! I am due 12th October!

Face Reality
Face Reality
10 months ago

I'm 12 weeks today!!!! Yay!!! I'm due Oct. 20th!!!

Vandana Nisha Sonkar
Vandana Nisha Sonkar
9 months ago

M 12 weeks pregnant anti scan done today but dr adviced me to come after a week for anti scan i am scared please help

Kamaile Mack
Kamaile Mack
9 months ago

12 days tomorrow and am already for my baby cause whew child😂😂

Sicina Parchment
Sicina Parchment
8 months ago

I hit 12weeks on June 13, 2020 it's so exciting to hear everything that's happening

shauntel morris
shauntel morris
8 months ago

I’m 12 weeks!!! 🥰😍🥰

Bree Tonee
Bree Tonee
8 months ago

I’ll be 11 weeks tomorrow with baby # 2 but my appointment is the following week. So I skipped week 11 video 🤣

Shibreyah Israel
Shibreyah Israel
7 months ago

i just turnt 12 weeks today july 11,2021😍🥰🤰🏽

Sajjad Ali
Sajjad Ali
7 months ago

Heyyy there congratulations to all future mothers out there.. I have come here to see how my little warrior is doing with his/her mom after 12 weeks. This never goes off of my head…love and best wishes for all of you….😘♥️
Feels like time has stopped… It's a Long wait to see your first child…

Life_With_The_Trotter’s
Life_With_The_Trotter’s
6 months ago

Officially 12 weeks today 🤗🤗🤗❤️❤️

Lisa Finn
Lisa Finn
6 months ago

I’m 12 weeks and don’t even feel pregnant anymore. I’m 18 and don’t have medicate so I don’t even get to go check up on my baby.😭 I wonder if everything is okay.

liberacion7
liberacion7
6 months ago

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take care

Madhu gemini
Madhu gemini
6 months ago

Im also 12.6wks… H.C.. cm65
Fetal heart 144 its.. good tell me baby boy or girl🥰

Annyetta Johnson
Annyetta Johnson
5 months ago

12 weeks tomorrow 🙏🏽🙏🏽🙌🏽🥰 Thank you lord

Shantel hall
Shantel hall
5 months ago

I'm 12 weeks today and I'm so happy

Sassy Lishaa
Sassy Lishaa
5 months ago

12 weeks & 3 days it’s been tough but thank god its getting better 🙏🏽☺️❤️

mamy Diagne
mamy Diagne
5 months ago

12 weeks today with our third baby, I had vomiting and nausea , I can’t eat anything, it’s normal ?

Laura C
Laura C
4 months ago

After 2 failed ivfs and 3 years of heartbreak and sadness I am finally pregnant and just approaching 12 weeks. I have my scan 2work. Nervous and excited

Spicy Stephanie
Spicy Stephanie
4 months ago

I’m 2 days away from 12 weeks 🙏🏼🙏🏼

Mrs Hightower
Mrs Hightower
4 months ago

I made it to 12 weeks 🥰👶

Jessica Victoria
Jessica Victoria
4 months ago

First pregnancy! Super nervous and excited!

Brittani Thomas
Brittani Thomas
3 months ago

I’m 12 weeks today! So excited 😊😊

soft touch
soft touch
3 months ago

Wow I'm here.. thank God

Itus Island
Itus Island
2 months ago

12 weeks with twins ! Paraguard iud twins

내 마음에 햇빛
내 마음에 햇빛
2 months ago

I’m 12 weeks today, due July 11, 2021. 💕🥲

FoodShowFan
FoodShowFan
2 months ago

12 weeks today, anymore July Mom's? Congrats ladies!

Any advice on things you wished you'd known from those further along? Thank you!

Posted By Claire

Claire is our Community Manager here at New Moms Forum. A mom of two (almost grown-up babies), Claire has been building and operating community-based websites for almost 20 years. In her downtime, Claire enjoys spending time with her family and drinking copious amounts of red wine!

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