Crybaby or cry baby?

Test No. [color=blue]incompl/inter-43 “A Crying Shame”, question 3

As a child she would burst into tears at every problem and so she soon got known as a regular at school.

(a) crychild
(b) cryinfant
© crybaby
(d) crygirl

Test No. [color=blue]incompl/inter-43 “A Crying Shame”, answer 3

As a child she would burst into tears at every problem and so she soon got known as a regular crybaby at school.

Correct answer: © crybaby
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Shouldn’t be ‘cry-baby’ ?

Regards:)

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Most dictionaries list it as one word. Try this site: http://www.onelook.com/?w=crybaby&ls=a
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I got confused because the dictionary I use (Cambrigde dictionary.cambridge.org/define. … &dict=CALD ) pointed it as a spelling mistakes.
Now it is clear for me that both forms may be used.

Many thanks for answer.
Regards:)