15 month old is starting to drink milk TMI POOP PIC

But does this look like an allergy?

No rash, and he seems to really love it. He had about 5 ounces (the most he has ever had, normally it’s an ounce or two) he won’t take it if I mix it with my breastmilk, it’s one or the other. He’s EBF.

His tummy doesn’t seem to be bothering him and he didn’t struggle to poop. This is his second BM of the day.

I’m just not used to seeing his poop so runny, so it’s a little alarming for me