If I were OP, the child I was carrying would be my last with that guy. Apparently he wasn't paying attention in biology class when they were studying genetics. I also suspect that if they were to decide to have yet another child who turns out to be a boy, the girls are going to be neglected by their dad. It happened in my household growing up, and the favoritism eventually came back to bite my dad in the kiester.

Sperm determining the sex of the offspring is basic middle school science. You learn XY vs XX in 6th grade, if not earlier. Sure you are usually in high school before they talk about other combinations than XX or XY, but the basics are basic. His willful ignorance is a huge red flag and nothing he is reported to have said does anything but ring the alarm bells louder. Great if this is what gets OP out of a bad marriage, but this is probably not the first time he's invented a new reality where science and logic don't apply. Folks, red flags mean danger, stop scrambling your DNA with hysterical misogynists.

In the words of Inspector Harry Callaghan, "A man's got to know his limitations". If you are ignorant about a subject, don't try to pretend you know it.

On a lighter note /some comic relief for your husband, maybe that info helps your husband overcoming his biology-dyslexia: and deep, profound grief over his "shortcomings"/s: Here in Germany we have a proverb about the sex of your offspring: "Jungs machen Jungs, Männer machen Mädchen."= " Boys make boys, (grown) men make girls." (Source: My dad, proud father of 3 girls cited this to a father of four girls. Made him instantly beam veeeeery bright.)

How does that belief persist? You need a Y chromosome to pass a Y chromosome on. If the offspring consistently lack a Y chromosome, that's on the parent who was contributing (or trying to contribute) it.

Hmm, XY you say...? 🤫🖖

She's NTA, her husband is a huge a$$hole, and she evidently may be more correct than she realizes. A man can have three girls in a row by chance - if it was perfectly by chance, one eighth of all couples who have three kids would have three girls in a row. However, there is evidence that men don't produce sperm at a 50:50 ratio, but some produce more sperm with X chromosomes, and some men produce more sperm with Y chromosomes. So not only do his sperm determine the sex of the baby, but his body is the one which determines whether the baby is more likely to be a boy or a girl. Personally, I am very happy that we had a girl, and I would have preferred that all our kids would be girls. I really shudder at the idea of having a mini-me, or having kids like my brothers. Also, biologically speaking, a daughter carries more of their father's DNA than a son (that Y-chromosome is pretty small and miserable).

Was he this pathetic when she was dating him? Or did his true colors come out after the wedding?

my parents had 6 girls. I asked mom once if they were trying for a boy, she said they planned for 6 irls. I figured out later parents lie.

His mom is wrong too. Yes the man determines the sex as it is the sperm who carries the Y chromosome (women only have x) but it is not "the more you have of one sex the more likely the other is the other one". That is not how statistics works.

She may not have a son, but she's got four children, and one is a pathetic little boy. She's NTA, but she's nuts for sticking with that man-child.

First, it’s amazing how many men are uneducated about basic human biology, something we all had to learn in school. Second, the sex of the baby is inconsequential compared to the health and happiness of that child. Misogyny unfortunately is alive an well and is like a cancer on society, especially women.

There ARE things which are related to birth order and gender, like third sons being LGBTQIA about 50% versus 10% on any other, or if both parents are left handed the kid has a 20% chance of being a lefty (versus 5% if both are righties). Having said that, that breeder male is clueless about genetics. I'll bet he claims "the clitoris is a myth".

So he started out blaming her (apparently trying to embarrass her in the process). She pointed out, in private, his ignorance. He then asks his own mother, who confirms he was ignorant and his wife was correct. And now he feels embarrassed by his own ignorance being called out, all on his own, but blames his wife. Yeah. I guess that makes sense. He's already shown he's not especially bright. So this seems reasonable. She is the AH for having kids with a moron.

While there are studies that show many factors in sex ratio, it's important to note they are talking about a small deviation over a large population. The huge jump in male birth ratio in Europe after WWII, was only 51.5% to 49.5%, so 2 out of 100. It may be statistically significant for a country, but for a family, the meaningful ratio is still about 50/50. I also want to point out that none of the factors are choice related, but genetic and environmental, so blaming the wife is inaccurate on several levels. Acting like a child when mother gives out more incorrect info only confirms he's an AH. There's a theory that men have a gene that can predispose them to siring male or female offspring, but no conclusive research. https://www.ncl.ac.uk/press/articles/archive/2015/08/boyorgirlitsinthefathersgenes.html#:~:text=Men%20determine%20the%20sex%20of,make%20a%20boy%20(XY).

So, if I understand this correctly, i$ your dad didn't father any boy children, then you won't either? ;)

HE asked HIS MOTHER a stupid question and somehow it's his wife's fault even though she told him he was wrong beforehand... It's a pity they're on their third child because this guy is not a keeper.

Middle school health class teaches this, then taught again in high school biology.

Speaking of genetics, I think your daughters are going to be dumb.