Sudden stomach pain after waking up with one episode of vomiting in an 8-year-old is most often due to a mild stomach infection (viral gastritis), indigestion from something eaten the previous day, or gas buildup, and it usually settles on its own within a day; less commonly, it could be due to constipation, food poisoning, or early signs of conditions like appendicitis (especially if pain becomes severe, shifts to the lower right side, or is associated with fever and repeated vomiting). For now, keep your child well hydrated with small sips of water or oral rehydration solution, avoid heavy or oily foods, and allow rest. You can give light, easy-to-digest foods once the child feels better. Seek medical attention urgently if vomiting continues, the pain is severe or worsening, there is fever, dehydration (dry mouth, less urine), or if your child looks very unwell.

For a 6-month-old baby with vomiting and loose motions, it is very important not to give medicines without a doctor's advice, as the correct dose depends on the baby's weight and condition. Emeset (used to control vomiting) is sometimes prescribed in small, weight-based doses, while Enterogermina may be given to help restore gut flora, but exact dosing must be decided by a pediatrician. The most important treatment at home is to prevent dehydration by giving oral rehydration solution (ORS) in small, frequent sips, continuing breastfeeding or formula, and offering light feeds if tolerated. Seek medical care urgently if the baby is unable to keep fluids down, has fewer wet diapers, becomes very sleepy or irritable, has blood in stools, or if symptoms persist beyond a day, as infants can become dehydrated quickly and need proper medical supervision.