It's classic signs of banana. Has he had any?
Lookslike banana to me as well. Also can be loose when teething???
I’d say banana if you’ve been giving it
My LB (EBF too) had little specks in his poo after trying broccoli! I didn’t think he swallowed any at all but obviously some went down! 😅
We also have had similar this am, also early stages of weaning- cauliflower yesterday! I wonder if it is just body getting used to digesting new things?
Looks like blood. My baby had this when he got diagnosed with cmpa x