Vomiting can happen due to various causes, including infection, food allergies, or even motion sickness. Dehydration occurs when a child loses more fluids than they take in, resulting in an imbalance that can affect body functions. Vomiting often leads to dehydration, especially in children, since they can lose a significant amount of fluids and electrolytes in a short period. Vomiting and dehydration in children can be especially dangerous because children are more susceptible to rapid dehydration, which can lead to serious complications if not addressed promptly.