Is it true some couples can only have either all male or all female DC?

[maybemumm]

My friend is pregnant and her DP has two daughters from another relationship. She said the baby would be a girl because her DP only makes girls, and it’s just confirmed to be a girl.

Is it true that some couples (men, in particular, as I know it’s men who influence it) can only biologically make either female or male offspring?

I've seen that (I have a friend with 8 boys)

Probably.

In Ye Olden Dayes they thought that one testicle was the ‘boy’ testicle and the other testicle was the ‘girl’ testicle.

I forget which is which.

Men would lob off one of their balls so they’d just have boys.

I don’t think it worked. Then they probably died of sepsis.

But if anyone’s TTC and handy with a pair of scissors it might be a fun little MN experiment.

No idea, but as the mother of three sons I'd love to know!

I heard this but don’t know if it’s true. There’s a mum at my kids school and she has 6 girls (No boys)

Er no that's true at all 😂

Each pregnancy is 50 / 50 chance of either sex. Its a biological fact. Its absolutely probably with those odds that many couples will only produce children of one sex.

Yep. It’s true

It may be that technically men choose the sex but the uterus can be hostile to certain sperm, do it may be that that influences it?

My uterus was hostile to all my ex Hs sperm.

The sex of the baby is determined by the father. As I understand it boy sperm moves faster than girl sperm but dies more quickly. And that is why more boys are born through IVF (they fertilise the egg quicker). Also look up Returning Father Affect.

Nope! I have one of each from my XDH…. 🤦‍♀️

As far as I understand biology, your premise is nonsense.

as far as I understand it, a man and a woman "donate" an x or y gene to the embryo. The woman can only "donate" an x. A man can "donate" an x or a y.

if the "donations xx, you've got a girl, if it's xy, you have a boy.

if you and your partner have a number of children of one sex, the chances of your next being of the same sex is, and always will be 50/50.

a man cannot always "donate" a x, otherwise he would be a woman.

I know a woman with 7 boys and 4 different fathers (no judgement, just facts!).

Given the male determines sex, 7 boys in a row is possible without there being some biological ‘issue’ (unless all 4 men had the same ‘issue’).

no its not true

think it through, how could it be?
baby's sex is determined by the mans sperm
1/2 of the sperm have an x chromosome, and 1/2 have a y

all mum's eggs are have an x chromosome

if a y one gets to fertilise the egg, result=xy=male
if an x one gets to fertilise the egg, result=xx=female

each time an egg is fertilised, there's a 50/50 chance of a male or a female

there will always be unusual cases of families with all boys or all girls- but that's because there are lots and lots of families, so probability predicts that sometimes there will be an unusual case

My understanding was that some women can't easily carry foetuses of a sex. I think there's often a genetic component and an embryo of the wrong sex won't implant or the pregnancy will end in miscarriage.

this is utter nonsense OP. The sperm determines the sex, based on whether the sperm has an X or Y chromosome. It’s not possible for a man to only produce one type of sperm as it would mean he was lacking the other sex chromosome which isn’t biologically possible.

I am no expert either, but what if there was something wrong with the man's Y chromosome such that every boy embryo he gathered failed to develop and resulted a very early miscarriage / failure to implant or something? Or very usually did, and not many people have enough pregnancies to see the e.g. 1 in 100 embryo that would survive.

Thank wouldn't make him a woman.

I am not stating this as fact, just that it seems possible to me.

My mum had 8 pregnancies. 4 births, 4 miscarriages.

All the MC were boys, all births girls.

She said she was told she was unable to carry boys.

Apparently not, there’s a theory that if you had 100 kids you’d have approximately 50 of each, but no one ever has that many to test the theory 🤷🏻‍♀️

I think that’s plausible, I’ve heard similar anecdotes to Shulda’s. One parent might be carrying a genetic disorder that means a foetus of one sex is less likely to survive to term.
I’ve also heard that some men do produce more male or more female sperm, although obviously across the whole population it evens out.

Scientifically no, it should be 50/50, but anecdotally, lots of couples seem to have only boys or only girls despite having lots of dc and the odds being 50/50 every time.

Of course it's not!

The posts here of people citing their own experience as evidence either way ...🤦🏻‍♀️

From a genetic perspective you have a 50:50 chance of having a boy or a girl with each pregnancy. There's some possibility that the timing of conception can affect sperm + hence influence the sex of the baby. But there's no evidence or meaningful way to prove this.

My parents first child was a still born boy at full term ( he would be 73 now). They went on to have five daughters . Besides the X/Y chromosomes etc this is what l was told.. and in my Dad's case was true he had six sisters and 2 brothers.

Why do some families have more daughters?
The researchers also found that the sex ratio for families followed the father's side, not the mother's side. For example, if a man had more brothers, his own children were more likely to be male; if he had more sisters, he was more likely to have daughters.

Very similar to a work colleagues wife years ago. She had four boys and her baby girl was very sadly stillborn . She was told that she'd be unlikely to carry a heathy baby girl.

I've known it the other way to.

I have a friend who had 3 miscarriages she is certain were all girls, she has 4 lovely boys.

School mum had a miscarriage she thinks was a boy and has 2 girls.

She was told that she'd be unlikely to carry a heathy baby girl.

That was a terrible thing for them to say. How could they have known?

It's really sad about her losses. But not evidence she couldn't have a girl.