I completely agree with you that coffee itself doesn't directly stunt growth, but I do believe coffee has many cons and these cons could contribute to lack of development for young children. As you mentioned, the real issue is caffeine's effect on sleep. Obviously coffee affects sleep because it has caffeine in it causing bad sleep patterns, holding back sleep and reducing deep sleep, which is so important for growth for a child during a young age. excessive caffeine consumption, even if not from coffee directly, can indirectly affect growth by messing with sleep. It's more reasonable to say that coffee doesn't stunt growth, but the potential for caffeine to disrupt sleep and, because of that, affect growth, is a legitimate concern.