My daughter is 5 years old, she has never had this issue before but for the last 4 days when she wakes up in the morning as she is eating breakfast she throws up. After she throws up she will continue eating and will be fine for the rest of the day until the next morning. I dont know why this is happening, she is not running a fever nor is she complaining of stomach pains.
Our stomach secretes acid which helps in digestion. It is secreted throughout the day. Throughout the night, the acid gets collected. This acid irritates the inner lining of the stomach. So, in the morning when your child takes in the food, the already irritated gastric wall revolts, and she vomits out the contents of her breakfast. But in the process of digesting the breakfast, the gastric acid becomes utilized and such a situation does not arise till next morning. Hence, she remains fine throughout the day.