He's my sister's third child and the only one with this skin tone, way yellower than his brothers. He's been like this since he was about 2 or 3 months old so I don't think it can be carrots in his diet since he only started solids just before 6 months. The whites of his eyes seem fine, and he's a bonny, happy little chap otherwise, growing very well. I don't want to go overboard but what do you think?
I'll put his pic up on my profile for a limited time, along with his brothers for comparison.