What can be administered to pediatric patients under 1 year old for general ingestion if it was consumed less than an hour prior?

Activated charcoal can be administered to pediatric patients under 1 year old in a dose of 1 g/kg orally if the ingestion of the substance occurred less than an hour prior. This is because activated charcoal works by adsorbing the ingested toxins in the gastrointestinal tract, preventing their absorption into the bloodstream. The dosage of 1 g/kg is specifically designed for children and helps to ensure both effectiveness and safety in this age group.

Using a weight-based dosing approach is particularly important in pediatrics, as children metabolize medications differently than adults. In the context of the other options, while activated charcoal in bulk amounts (like 25g) may be appropriate for adults or older children, it does not follow the pediatric dosing guidelines and could pose a risk of choking or gastrointestinal obstruction.

Intravenous fluids are typically used for rehydration or electrolyte replacement rather than for emergency treatment of acute ingestion. Lastly, "nil per os," meaning nothing by mouth, would not be appropriate in this scenario since the intent is to prevent toxin absorption after ingestion. Thus, the appropriate course of action is to administer activated charcoal at the specified dosage of 1 g/kg to effectively manage the situation.