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!

I had girl, boy, girl, boy. Sorry OP you’re wrong

My partner is 3rd child and his went BGB

Not true at all

My grandparents had BGGGGBGG

My mother and her siblings who had 3 or more:
BBGG
GBG
GBB
BGG

Just random, I think.

I reckon I know just as many GBGs as I do BGG

Absolute rubbish. GBG here

GBB. Do I win?

Nope. Same dad, no miscarriages. The two eldest are the same gender, the third a different gender

I was going to say this theory is wrong based on my BIL and his fiancé, who have GBGG (and GG on the way), but then I thought of everyone else I know who has a big ish family:

A work colleague has BBB.
I had a teacher who has BBBBB
My parents neighbours have BBBGGG
My dad’s family was GBBG,
my husband’s family is also GBBG,
I’m not sure about my mum’s side as it’s too big, but out of her sisters who have more than 3, it went:

GGGBB
BGGBG
GBBB.

now I’m a convert.

My 3 are BGB and my parents had GBG. Your theory is shite I'm afraid 😂

Not true.

My friend is the eldest of three:

GBG

I'm one of 4. All same dad, no miscarriages. And we are gbgg.

My aunty had 4 ggbg
my friend is one of 4 ggbb
However DB does fit, 3 kids bgg.

My mum had GGG. My middle sister had GBGBG. I didn’t have three so I’ll never know …

BGB for me too

Sorry, I’m afraid that both of my currently pregnant friends are BGB!

I have four friends with 3 kids and they are GBB, BGB, BGB, BBG so no pattern there.

The man’s sperm determines the sex so it literally is 50/50

I've never noticed this pattern anywhere, I have 6 kids , BGBGBG

Kate Middleton
The Queen

Nope bbgg my siblings gbgb

I have had Boy, Boy, 5 week miscarriage then a Girl. All same dad

we also have this - 3 years 3 kids gbg

In my very small sample of friends and family it tends to be the opposite: BGB or GBG. Two of my closest friends each had BGB. I have one of each amongst my cousins: BGB and BGG.

You need to look into probability 🫣

you have:
BBB, BBG, BGB, BGG, GBB, GBG, GGB, GGG as the full 8 options.

2 options are non-consecutive sexes
6 options have consecutive sexes

so obviously you are going to get a 25:75 split in favour of consecutive sexes. (This is in reference to quoted post)

BUT to your first post, it is a 50:50 chance of baby 2 and 3 being the same sex…obviously 🫣

I've thought about this loads of times but the other way around....every 3 kid family I know is BGB or GBG, I always know what the 3rd will be.