Ma'am, my son is 8 years old; he weighs 40 kg and stands 4 feet tall. Since February, he has suddenly started looking quite chubby—his face has become very round, and his body has also filled out a bit. Moreover, Ma'am, my son doesn't eat any outside food or junk food at all; he even drinks his milk with sugar. I am getting worried, Ma'am—why is he gaining so much weight?