Final answer:
After a baseball hit to the stomach, monitor for swelling, bruising, tenderness, and signs of shock, as changes in condition can indicate a serious injury requiring medical attention.
Step-by-step explanation:
If your teammate gets hit in the stomach with a baseball, you should watch for symptoms that may indicate a serious injury. These symptoms include: swelling of the injured area, bruising, tenderness, and signs of shock. While some symptoms may not appear serious at first, it is important to monitor the individual, as conditions can worsen. Symptoms like vomiting and diarrhea could also indicate internal injury or shock and would require immediate medical attention.