Help- developing product for small Kids with Insulin pump

We are now developing panties for kids wearing Insulin pump in sizes:
3-4years
5-6 years
7-8 years

We have panties for Adults with the pocket in front. This because you easy can take the insulin pump out and into the pocket, it is also because you easy can exercise and hide the Insulin pump under the clothes.

For the small kids we need to move the pocket to a new position. We would like to find a good solution for the kids. Can you please help us with answering some questions?

Should the pocket be placed in front or on the back of the panties? We know this is different depending on age of kid. Could you please send as a comment back or front and age of kid? Or send us an e-mail to info@annaps.com. If you also have time to motivate the answer then it gives us even more help.

Thanks a lot for your help!
Anna Sjöberg
AnnaPS