Why do some babies cry at cow (moo) sounds while others laugh?

There are several babies that get so scared whenever they hear moo.

My friend tried the cow sound on her baby girl and it was the opposite. She started laughing. She laughs whenever she hears moo, regardless of who is making the cow sound.

Why do some babies cry over that while others laugh? Is there something special with the cow sound?

Why do some babies cry at cow (moo) sounds while others laugh?
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