Why is it more likely for 3 of the same sex???

[~clover~]

So, since I last posted in here things have gotten more interesting

My SIL & sister are both expecting. SIL's second with my brother (third for her) & my sister's first.

As I said in my previous post, my dad & his 2 brothers both had girls, then boys. I had a girl first, my brother has a girl first & my sister is expecting a girl first. Not sure what my brother & SIL's expected baby is though.

My first cousin (only of our 1st cousins so far to have a bub), also has a girl first

[raffy]

We are expecting a little girl after 2 boys, we did gender sway but, whether that helped or not I don't know but I'm over the moon to complete our family with a little lady

[ladybirdflies]

So thats where my girl went - I got your boy

hahahaha!!! true that!!

[FancyPants]

I definitely don't think it's a 50/50 chance. Female sperm are hardier in different conditions than males. Female sperm can survive longer than males, so timing can be a factor. Also I heard somewhere that some men just produce more of one sex than the other. Also men's lifestyles can factor in to the hardiness and numbers of males and females.

[BlackRose]

Actually sperm count is 50/50 x and y in equal amounts. For sperm to form it needs to split from a parent sperm cell that contains both an X and Y chromosome. There is a website that has debunked a lot of the myths around gender chances.. I think it's called gender dreaming or something. It was actually very interesting and put a lot of the current theories (genetics, family history,shettles, O+12 mothods) under the microscope and pretty much proved them all wrong.

[nyigi]

Interesting BlackRose, do you have a reference or link to that study? I'd love to read it.

[Amaunet]

Be careful of the Gender Dreaming website. She has her own agenda - selling her "personalised sway plans". I was doing a lot of sway research and bought a "girl/low everything" plan. Complete rubbish, lots of contradictions, nothing personalised and quite frankly dangerous nutritionally. No actual studies, just her "interpretation" of other studies iykwim. She also gets really narky if you ask any challenging questions.

I used the Shettle's Method after much reading and research. It's been around a long time It worked for us!

[ticklish]

Actually sperm count is 50/50 x and y in equal amounts.

I don't believe that is true. I did research into this when we were expecting number three after already having two children of the same gender.

Not all men produce x and y sperm in equal amounts. Some men do, some men produce more x than y, and some men produce more y than x.

You are more likely to have three of same gender if your first two children are boys as nature slightly favours baby boys.

TICKLISH

[ticklish]

Sorry double post

[Sorka]

I have five boys (all with same father and approx two years apart) and was told it was more than likely because my husband produced a lot more/ stronger male sperm and my chances of conceiving a female with him were very slim without medical intervention.

With five boys already I don't think I'll risk it to find out

[BlackRose]

Ticklish - I have to disagree with you there.. For sperm to form it splits into two from a parent sperm. This parent cell is an XY cell so when it splits to form a sperm cell it forms one X sperm and one Y sperm. From what I have read it's the environment of the female vaginal tract that dictates which gender survive better than the other through to the uterus.. Acidic or alkaline conditions.. And so a female diet subsequently can help alter the vaginal pH to favour a certain gender surviving over the other.

I still believe it's mostly luck though..

[ticklish]

Blackrose - I agree that it is mostly luck too.

It doesn't matter what proportion sperm is produced in it is what comes out that matters, pun intended.

There is some interesting articles which I have read which indicate that the tendency to produce one gender over another in families is inherited from the male, leading to the conclusion that there is a genetic tendency in some male to produce semen which contains more than one sex over another.

Other factors which have been found to alter the X versus Y chromosones in semen in males are:
- age
- climate
- occupation
to name just a few. The Y chromosome is shorter than the X and more fragile so it is thought to be more at risk of damage therefore even if sperm is produced in equal amounts, it doesn't necessary come out that way, and it can even vary from day to day, week to week. Heat is a common source of damage to sperm and also lifestyle factors can affect it too. Of course female factor can also influence things so it just turns out to be a bit of luck to see how things turn out.

All things being equal the natural ratio of baby boys born to baby girls is 105 to 100, giving a natural birthrate of 51.2% male and 48.8% female.

Back to the original question, regardless of any other factors you are always more likely to have a boy.

So if you have two boys first, then there is more of a chance that the third will also be a boy. Even if you have two girls first, you are more likely to have a boy third but of course there is a high chance of a girl too independently of there being any factors which make one gender more likely than another.

75% of families with three children actually contain 2 genders. Only 25% are single gender.

TICKLISH

[ticklish]

Blackrose - I agree that it is mostly luck too.

It doesn't matter what proportion sperm is produced in it is what comes out that matters, pun intended.

There is some interesting articles which I have read which indicate that the tendency to produce one gender over another in families is inherited from the male, leading to the conclusion that there is a genetic tendency in some male to produce semen which contains more than one sex over another.

Other factors which have been found to alter the X versus Y chromosones in semen in males are:
- age
- climate
- occupation
to name just a few. The Y chromosome is shorter than the X and more fragile so it is thought to be more at risk of damage therefore even if sperm is produced in equal amounts, it doesn't necessary come out that way, and it can even vary from day to day, week to week. Heat is a common source of damage to sperm and also lifestyle factors can affect it too. Of course female factor can also influence things so it just turns out to be a bit of luck to see how things turn out.

All things being equal the natural ratio of baby boys born to baby girls is 105 to 100, giving a natural birthrate of 51.2% male and 48.8% female.

Back to the original question, regardless of any other factors you are always more likely to have a boy.

So if you have two boys first, then there is more of a chance that the third will also be a boy. Even if you have two girls first, you are more likely to have a boy third but of course there is a high chance of a girl too independently of there being any factors which make one gender more likely than another.

75% of families with three children actually contain 2 genders. Only 25% are single gender.

TICKLISH

[Dustmite]

My wife & I had two girls. Five years later we had a boy, then another boy. We even heard from Doctors that from that point on we had higher odds of boys. Sadly my wife's uterus has been stuck on baking boys. We have now had 4 boys in a row.