Eh, lepas muntah air gula memang kena minum balik lah, tapi tunggu sikit dulu, biar perut dia settle dulu maybe 15-20 minutes, then give in small sips je, jangan sekali gus. A few of my mum friends kena through this during glucose tolerance test, they all suggest minum slowly-slowly, maybe 2-3 tablespoons at a time, sebab kalau tergesa muntah balik, the test kena repeat. Kalau muntah lagi after you try minum slowly, better inform the clinic nurses because they might need to adjust or reschedule, some kids memang tak boleh tahan sweet drink so much at once, so don't worry!