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!

Sex is determined by the sperm. Your DH's sperm have no idea what the last two "successful" sperm did.

I'm starting to understand why horoscopes are so popular.

Sorry also not true, my friend has three GBG and all with her husband

BBB for me. Then G

Not true for my parents, my DH’s parents, my grandparents, any of my friends or cousins, or many of the families at school? 🤷🏼‍♀️

My mum had BBBBGGBGGB

I have GBG - same Dad no miscarriages.

the B in the middle was huge so when 3rd time they said the baby was normal sized I was pretty certain she was a girl. We didn’t find out the sex for any.

You’re wrong……me and my siblings are GBG

My maternal gran had
BGBB
My paternal gran had
BGBBBBBBB

ETA yes my gran had 9 children all the same father (Catholic) my dad has 7 brothers and a sister
My mum has 3 brothers and 2 step sisters.
I have a lot of cousins.

Part of it is true

If you have 2 of the same (either BB or GG) there is a 70% chance the third is also that sex

Wrong for me, then I realised I'd had two miscarriages between two and three, one a twin. I don't know what sex they would have been.

This.

Ha, I do notice this a lot too actually!

BUT I have three... same dad... no losses in between... GBG!

Interesting theory but incorrect.

I’ve been thinking for ages of creating a tally of the order of sexes for everyone I know with three or more children. Might have to try it.

I had GG - miscarriage - GB

You’ll all notice it now I’ve said it!

Errr, no! 😂

I know two families with BGB and four with GBG!

Some of these examples we don't know if they had miscarriages in between..

I have BGB

Look up how to make a probability tree OP!
For this calculation we’re going to assume a 50/50 chance of having a boy in each pregnancy.
In families with three kids :
In 50% of families, the first child will be a boy, In the other 50%, a girl.
When the second child is born, the combos look like this :
25% BB, 25% BG, 25% GB, 25% GG
When the third child is born, the probabilities look like this:
12.5% BBB, 12.5% BBG, 12.5% BGB, 12.5% BGG, 12,5% GBB, 12.5% GBG, 12,5% GGB, 12.5% GGG.
So the likelihood of a 3 child family having the combo BGG or GBB is exactly the same as the likelihood of a 3 child family having either the combo BGB or GBG.
But if you include the BBG and GGB combos then yes, you’re twice as likely to have two the same sex in age a order than either BGB or GBG. Maybe that’s why you feel like BGB or GBG is a less frequent combo?
You also have a 1/8 chance of having all boys and a 1/8 chance of having all girls or a 1/4 chance of having 3 of the same sex (either all boys or all girls).

I have BGB, as does my best friend. I myself am the girl in a GBB combo though!

Unless I've miscalculated because I'm tired the statistical chance of having 3 the same is 1/4. But I know more people than I should with 3 the same based on that.

😂😂😂😂😂 NOPE
Friend has GBG
Family BGB
Family GBG
Family GBG
Family BGB

Sorry OP but you’re literally making up stupid statistics there 😂😂😂

GBB for us

Come to that, you don't always know yourself if you had a chemical pregnancy.

I assume I haven't, but with irregular cycles I can't be certain.

Also the theory is bollocks, but it's the faffy "no miscarriages" bit that irks.