How do doctors keep mistaking the wrong gender?

Can they be sued or is it just an educated guess? The docs told my mom she was having a boy but she had a girl instead. They bought all sorts of blue stuff and boy clothes in preparation. When she gave birth, they were surprised to get a girl instead. They already had a boy name picked out for me, thus explaining whats now my middle name. A lot of my classmates parents were told the opposite as well. I honestly wouldn't even do a gender reveal party because its likely to be misleading. I rather just find out when I give birth and i’ll decorate the nursery with neutral colors like pastel yellow. My babys name is unisex anyways.
The docs told us wrong too
The docs got it right with us
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How do doctors keep mistaking the wrong gender?
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