If your baby has 10 or more bowel movements in a single day, this is considered excessive and requires immediate medical attention to prevent dehydration. Do not wait to observe further; contact your pediatrician, use a telehealth service, or visit the nearest children's hospital/emergency room promptly. Frequent, watery stools can lead to rapid fluid loss, so prioritize getting professional advice to determine if it is a viral infection, a reaction, or another concern.