If an older child falls more than two or three feet, check with the doctor about what should be done. Where an older child can articulate his distress, a younger child may get the message across through incessant crying. If a child vomits just once or twice, and the contents are undigested food, you can take care of that at home. If vomiting persists, call the doctor. And if the vomit is greenish, the child needs to be seen by a doctor.
Greenish vomit indicates bile, which is intestinal content.
Loose stools for a few days are not a big deal. Any sign of blood in the stool should be discussed with your pediatrician. Parents need to have a sense of how much the child is drinking and urinating. A child should urinate at least three times in 24 hours. An older child with dehydration may have a very dry mouth and lie around without much energy.