Context #1
Steve: Man, our teacher gives us way too much homework. It's not fair.
Chris: Oh, it's not that much. Don't be a crybaby.
Context #2
Bethany: My little brother is such a crybaby.
Jody: My little brother is pretty tough. He never cries.
Bethany: My little brother cries over everything.
Meaning: "to be a cry baby" can be used for children or adults. When used for children, it describes a child that cries a lot and even over small issues. When used for adults, it describes someone who complains a lot, especially over little things.
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