Am I a stupid for asking that to my pregnant coworker?

I have a pregnant coworker and I asked her why do babies kick inside the womb she replied because he's alive and he has brain thats why he moves thats his brain activity. And she laughed and made fun of me like sometimes my questions are not funny. I didn't meant that question to be funny I was just plain curious and asked her. So I felt kinda stupid for asking that..
Am I a stupid for asking that to my pregnant coworker?
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