How do I know when a kid needs new shoes?
user
Can you tell me a bit about the kid and the shoes?
assistant
Just tell me in general
user
Sure, in general kids tend to get bigger at about a 1 cm per month, and the shoes will be too small within 6 months.  
Is there anything specific you wanted to know?
assistant
So you think we should change them every six months?
user
Sounds reasonable to me.
assistant
Any other tips?
user
I would recommend making sure they can wiggle their toes, if you check this regularly, it will help you keep track of how their feet are growing, and it will also keep their feet healthy.
assistant
How do I know when a kid needs new shoes?
user
Can you tell me a bit about the kid and the shoes?
assistant
Just tell me in general
user
Sure, in general kids tend to get bigger at about a 1 cm per month, and the shoes will be too small within 6 months.  
Is there anything specific you wanted to know?
assistant
So you think we should change them every six months?
user
Sounds reasonable to me.
assistant
Any other tips?
user
Oh! I remember something!  Kids tend to put their feet on furniture all the time, so I think they’ll be in a chair once per day or so.
assistant
How do I know when a kid needs new shoes?