Poop pic - very green

Little one is 3m old. Git the odd green poo but now everyone is like this and multiple times a day. Also has bad eczema and constantly sounds congested but weight gain is great. Could it be allergy related?

Little one is 3m old. Git the odd green poo but now everyone is like this and multiple times a day. Also has bad eczema and constantly sounds congested but weight gain is great. Could it be allergy related?