Obstacles that could be hazardous in a toddler's toy room? (9,6)

I believe the answer is:

stumbling blocks

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

'obstacles' is the definition.
(a stumbling block is a difficulty or obstacle)

'hazardous in a toddler's toy room?' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'that could be' is the link.

Can you help me to learn more?

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

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