punctuation - 13 Month Old or 13-Month-Old?



I have just installed Grammarly and it showed up something which i am not sure of.


It corrected '13 month old' to '13-month-old'.


The context is



I ask because my 13-month-old God daughter seemed like she was a little resentful towards another child who was visiting at the same time.



Which would be correct, and why?




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