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December is actually the tenth month. Jan & Feb were added later. It’s the tenth month that was added, though not the tenth month since the start of the year. The array of calendar months was shifted to make room for two additional months at the beginning of the year.

If I have a son, in December, then I have another son the next year in January, which one is my first son?

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> Jan & Feb were added later.

At which point it was no longer the tenth month.

My tenth son will always be my tenth son. Though his birthday falls 10 months after that of my twelfth son (whose birthday came in the second month of the calendar year in which he was born), my tenth son will always have come out of the womb tenth!

> My tenth son will always be my tenth son.

Unless you find you had two other sons you didn't know about.

In that case, he would have never been my tenth son, I would have only thought he was. No matter how hard we try, birth order is one of those things that can’t be changed, even with a revelation. Our mental model of it can be corrected, but the order itself is immutable.

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