Extended report (for a better word)

Hello everyone

I'm trying to buid a report to compare litters weights over a period of time.

I have created a table with those fields.

Now in my report I'd like to see data sorted the way I can do it on an excel sheet. I want a way to evaluate weight growth between litters and by days.

There can be 1 to 12 puppies per litter, of course it's never the same. If it's impossible to have 2 litters side by side, at least I'd like to have the puppies (colors) from one litter side by side.

Any Idea how I can create this?

Thank you

Isa