Digestive issues in 11 month old

Hey ladies. Weird question:

What does your 11 month olds poop look like?

My son has had digestive issues since birth and is on a hypoallergenic formula and now that we’re working on eating solid foods he’s developed hives.

We’ve tested a few things, and can’t find the culprit so they’ve suggested a celiacs test.

I’m curious to know what normal poop looks like, since gray has really only ever had loose stools. (Runny, no clumps, diarrhea like that burns his skin)

Thanks in advance!