Sounds mad but it’s true, honest! If you have 3 kids…

[Nunaluna]

Same dad, no miscarriages to ‘break the chain’, if the first 2 are opposite sex, the third will be whatever number 2 was - so BGG, or GBB. Not BGB, or GBG.

It sounds crazy but it’s something I noticed ages ago - every time somebody announces they’re having a third, and they have one of each, I know it will be the same as the second child.

Prove me wrong, Mumsnetters!

Same Dad. No miscarriages. BGB

Good point, that’s exactly what happened to me!

Don’t know anyone who has 3 kids where it has followed that pattern sorry!

I do know 95% of everyone I know with 2 kids has the same though. Barely know anyone with one of each

William and Kate had BGB

Sorry your theroy isnt correct. I have gbg

Sex is determined by sperm so my dps kids are BGB.

To whoever mentioned the Cambridge's kids there would be no real way of knowing if they born in a unbroken line, Kate's always classed her pregnancys as high risk & approved information being released about hospital visit, long pre-maternity leaves & is widely assumed to have now had a hysterectomy.

So possibly a few generations down the line it may come out that she struggled quite a bit & might have tried for a 4th or lost a few along the way.

It's a bit mad to insert pretend possible miscarriages to suit OP's theory rather than accept that any baby might be boy or girl, particularly given there is no particular reason why BG / GB pregnancies would have any impact on which sex is born next. We know a lot of multiples where it's all over the map but ignoring later siblings GBG and BGB seem to be most common, it's meaningless.

Not true, I have BGBG.

Wrong - mine were GGB.

Nope, my Aunts kids were BBG, and I have a friend who is BGB.

Friend has BGBGB.

Couldn't be more wrong for her!

I have two kids BG. By this logic if we had chosen to have a third child then DD would’ve got her wish for a sister. But that’s never gonna happen now because I split up with their dad and there’s no damn way I’m having another kid.

No it's different in my family sister has BGBGG.
Look at Princess Catherine BGB.

BGB for me

Nope. Friends 1 & 2 & 3 have BBG. Friend 4 has GBG. BIL has G then twin B (actually not sure that counts), stepson has BGB. I do know two families that have three of the same sex, but definitely more who have the third different to number 2. Of those who have more kids: BGBGG, BBGB, BGGBB (ah that one works for you)!

The OP not talking about when the first two children are the same sex

if the first 2 are opposite sex, the third will be whatever number 2 was - so BGG, or GBB. Not BGB, or GBG.

She's wrong with my DC still though- same father no miscarrages DD1,DS,DD2.

Plus knowing about misscariages may not be complete right outside close freinds/family but suspect OP has confirmation bias.

That's not to say some couples do not have 50/50 chance or that wider things can't influence ratio of sex born - even subtle things in UK in 1973-74 more boys than girls ever were born.

Uncharted with Hannah Fry 1. The Returning Soldier

Nope.
I had GBG
My mum had BGBG
Her mum had BBGG
MIL had BBG

There are all sorts of things people talk about when it comes to siblings matching for not.

I heard someone say that the first born favours the father in looks and hair colour, and the second the mother.

There will always be someone who matches the theories.

I have ggb

I have BGB

Mine are BGBG (and dh has two older BG)

AI Overview
Learn more

"ggb" can refer to several different things, including:
General Government Balance (GGB): A metric used to measure the fiscal performance of a government.

Gangrenous cholecystitis (GGB): A severe form of gallbladder inflammation where tissue dies due to severe infection or obstruction.

GGB Bearing Technology: A global company specializing in plain bearings.

Other uses: GGB can also refer to various companies, objects, or people, including GGB industries, the Golden Gate Bridge, and others.

Are we allowed to know which?

I have a mental image of sperm having a conversation on their way up the passage, deciding who will get there first and do the deed.