Husband Blames Wife’s Family Background For “Only Making Girls”, His Mom Had To Step In

Some conversations start lighthearted and suddenly take a turn you never expected. OP and her husband had just learned they were expecting their third daughter when he made a comment blaming her for “always having girls.”

OP tried laughing it off at first, but when he doubled down, insisting her sisters somehow determined their baby’s gender, she couldn’t help correcting him.

What followed was a car ride full of back-and-forth arguments about basic biology, topped off by him saying he’d ask his mom because she “has a degree in biology.” When they arrived, his mother confirmed exactly what OP had already explained: men determine the baby’s sex.

Instead of accepting it, her husband walked out, upset that she “embarrassed” him. Now OP wonders whether correcting him in front of his family was out of line. Keep reading to see if she was the a**hole for setting the record straight.

Husband blames his wife for “only making girls,” then gets upset when biology proves him wrong

When people imagine their future children, they also imagine the dreams attached to them. So when reality clashes with hope, especially around something as symbolic as a child’s sex, disappointment can show up in complicated ways.

In this story, OP’s husband wasn’t just reacting to the ultrasound; he was trying to make sense of an outcome he wished were different. OP, meanwhile, simply wanted to celebrate her pregnancy without being blamed for biology she doesn’t control.

From a factual standpoint, OP was correct to push back against her husband’s assumptions. According to the U.S. National Library of Medicine (MedlinePlus), it is the father’s sperm—not the mother—that determines a baby’s sex.

Eggs always carry an X chromosome; sperm carry either X or Y. An XX pairing results in a girl; an XY pairing results in a boy.

This is also confirmed by the Cleveland Clinic, which explains clearly that “the sperm determines the sex of the baby” since only sperm can contribute a Y chromosome.

The husband’s theory about siblings, cousins, or family patterns controlling sex outcomes has no scientific support.

The National Human Genome Research Institute (NIH) notes that sex determination is a chromosomal event, not a trait passed down like hair color or height.

Psychologically, however, his resistance makes sense. Studies show that when people feel emotionally invested in an outcome they cannot control, they often turn to folk explanations or family myths to regain a sense of agency.

Research published in Frontiers in Psychology explains that people rely on “intuitive but inaccurate beliefs about genetics” when faced with emotionally charged information.

So his insistence wasn’t really about biology; it was a defense mechanism against disappointment.

His embarrassment later on aligns with another well-documented emotional reaction: shame. The American Psychological Association notes that shame often leads to blame-shifting, especially when someone feels exposed or corrected in front of others

OP didn’t mock him; she simply stated correct information. But to someone already embarrassed, even gentle correction can feel like an attack.

There’s a quiet sense of justice in OP holding her ground. Facts matter, especially when they protect someone from unfair blame.

See what others had to share with OP:

This group says genetics proved the husband wrong and he embarrassed only himself

These commenters stress it’s the husband’s biology at play and warn against having kids just to chase a boy

This group calls out his ignorance and ego, saying he tried to shame OP and backfired

These users say he’s projecting insecurity and blaming OP instead of accepting facts

This group says he doubled down, got proven wrong, and now wants someone else to blame

Would you call out your partner’s misinformation, or keep the peace and let them learn later? Share your thoughts below!