Guide: Pregnancy trimesters vary depending on country

[Wobbles]

Depending on where you live, trimesters may vary. If your country is not listed below, make a post in this thread and we'll update

First Trimester
US & Canada: Conception > 12 weeks
UK: Conception > 13 weeks


Second Trimester
US & Canada: 13 > 28 weeks
UK: 14 > 26 weeks


Third Trimester
US & Canada: 28 weeks > Birth
UK: 27 weeks > Birth


In the interests of website standards, BabyandBump.com starts pregnancy from the first missed period and splits 40 weeks of pregnancy into 3 equal sections:

First Trimester Forum: Conception > 13 weeks
Second Trimester Forum: 14 > 26 weeks
Third Trimester Forum: 27 weeks > Birth

 

[MommyMika]

I was confused, so this helps a lot!!! Thanks for posting this!

 

[myfirstone]

thanks for the post

 

[Flip flop]

Oh now I understand, thanks Stir Crazy. That would make sense as I found out I have cousin in Canada who is 10 days behind me but already had her scan! She got to announce it before me even though I'm ahead...a bit annoying.

 

[monkeys mum]

Australia is the same as the UK

 

[amotherslove]

omg, this makes so much sense now.. my books all say 13 weeks.. but everyone here says it's 12. haha

 

[LarLar]

Thankyou although i'm from the UK and have always been told 2nd trimester begins at 12weeks.

 

[hapi2bhealthy]

Really? I was told by all my docs that first tri ends after 12 weeks in Australia. Unless that really means as of the day baby "turns" 13 weeks I am in second tri?

(baby measured 13 weeks when lying on her back anyway!)

So now I am past 12 weeks am I first tri or second tri...??

 

[littlesteph]

I'm pretty sure UK start the second tri at 13 weeks thats what my midwife tells me and all my apps.

 

[MoodasMomma]

VERY interesting. thanks!

 

[Wriggley]

thanks but confused! im UK and everything points to 12 weeks ???

 

[ickle pand]

Depending on where you live, trimesters may vary. If your country is not listed below, make a post in this thread and we'll update

First Trimester
US & Canada: Conception > 12 weeks
UK: Conception > 13 weeks


Second Trimester
US & Canada: 13 > 28 weeks
UK: 14 > 26 weeks


Third Trimester
US & Canada: 28 weeks > Birth
UK: 27 weeks > Birth


In the interests of website standards, BabyandBump.com starts pregnancy from the first missed period and splits 40 weeks of pregnancy into 3 equal sections:
First Trimester Forum: Conception > 13 weeks
Second Trimester Forum: 14 > 26 weeks
Third Trimester Forum: 27 weeks > Birth

I'm confused. If first tri ends at 13 weeks and 2nd tri begins at 14 weeks, where would someone who is 13w4d be?

 

[girlinyork]

Depending on where you live, trimesters may vary. If your country is not listed below, make a post in this thread and we'll update

First Trimester
US & Canada: Conception > 12 weeks
UK: Conception > 13 weeks


Second Trimester
US & Canada: 13 > 28 weeks
UK: 14 > 26 weeks


Third Trimester
US & Canada: 28 weeks > Birth
UK: 27 weeks > Birth


In the interests of website standards, BabyandBump.com starts pregnancy from the first missed period and splits 40 weeks of pregnancy into 3 equal sections:
First Trimester Forum: Conception > 13 weeks
Second Trimester Forum: 14 > 26 weeks
Third Trimester Forum: 27 weeks > Birth

I'm confused. If first tri ends at 13 weeks and 2nd tri begins at 14 weeks, where would someone who is 13w4d be?

13+4 is first tri. You hit second tri at 14 weeks and third tri at 27 x

 

[ickle pand]

Ok thanks

 

[LaDY]

Only just read this...very helpful! Thank you x

 

[Keyval]

I'm gonna guess that Ireland is the same as UK weeks

 

[StillPraying]

Thank you B&B for making some uniformity!
My MW told me 14 weeks is 1st tri.

 

[emilymoore003]

Hi,
Nice information shared here about Pregnancy trimesters. Really very much informative.

Thanks for sharing !!

 

[EleanoirRigby]

I remember being over the moon with DD at 12 weeks to start the 2nd trimester, and then being told the correct weeks. I'm now over the moon with this little love bug at 14 weeks

 

[carolinecabre]

Thanks for sharing this information.