Crossword Genius

How baby perhaps loses its cool? (5,3,5)

Ross

I believe the answer is:

spits the dummy

I'm a little stuck... Click here to teach me more about this clue!

'how baby' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'perhaps loses its cool?' is the wordplay.
I cannot quite understand how this works, but
'perhaps' could be 'y' (I've seen this in other clues) and 'y' is found in the answer.
'its' could be 'it' (I've seen this in other clues) and 'it' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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