Final answer:
Vomiting is the clinical manifestation that would cause a nurse to suspect that a toddler has ingested a corrosive agent, such as bleach, due to the immediate harm and irritation to the esophagus and stomach.
Step-by-step explanation:
If a toddler-aged client ingests a corrosive agent, such as bleach, which is an alkaline or acidic substance contained in many household cleaning products, a clinical manifestation that would cause a nurse to suspect poisoning is vomiting. Inhalation or skin contact with bleach can also cause symptoms due to the caustic nature of these substances. Vomiting would be a significant indicator due to the irritation and potential burning that corrosive agents can cause to the esophagus and stomach upon ingestion.
Other symptoms of ingesting a corrosive agent may include pain, drooling, difficulty swallowing, and burns around the mouth. However, among the options provided, vomiting is a direct and immediate response by the body to expel the harmful substance, making it a likely clinical manifestation for a healthcare professional to observe as a sign of ingested bleach or similar products.