Why do babies cry when my sister carries them, but calm down and giggle when I carry them?

I'm a guy, I could care less about babies.

This holiday season, I carried a lot of babies.

My sister is upset. She wants to have a baby someday. But whenever she carries a baby, the baby cries.
The babies seem to calm down and giggle when I carry them.


Why do babies love me, and hate my sister?
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