Q. A 7-year-old child, recently immigrated from Southeast Asia to the U.S., presents to the clinic with his mother. He had been previously healthy, but two weeks ago, he experienced a bout of rotavirus gastroenteritis. After recovering from the infection, his mother noticed that he began to exhibit bloating, cramps, and significant flatulence shortly after having his morning breakfast, which typically includes cereals. The symptoms seem to get worse as the day progresses. Based on the patient's history and symptoms, what is the most likely diagnosis?