Why are there so many babies being born transgender or is it that they just don't like being a boy or girl and want to switch genders? Which is it?

Is a transgender born with a birth defect that physically causes them to be transgender? I am an older woman, and can honestly say that I never heard of kids that are transgender until recently. It makes me wonder if this is just a new fad - and won't be such a big deal in years to come. We probably won't even hear about it someday. If it is a physical birth defect then why don't we ever hear about it from medical professionals? Like, transgender babies are growing at a high rate in the past 20 years or so? A lot of questions are raised about if it's a real physical condition caused by a birth defect. It makes people wonder what's really up with them.
Why are there so many babies being born transgender or is it that they just don't like being a boy or girl and want to switch genders? Which is it?
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