Which route of entry is most effective for pesticide absorption in small children?

Ingestion is indeed the most effective route of entry for pesticide absorption in small children. This is primarily because children, especially toddlers, exhibit behaviors such as hand-to-mouth actions, where they may inadvertently ingest pesticides that may be present on their hands, toys, or other objects. Their smaller body size and higher metabolic rates also contribute to a greater relative impact from ingested substances.

Pesticides can be found in various forms, including residues left on surfaces or as components in food or drink. Small children are particularly vulnerable because their natural curiosity leads them to explore their environment by tasting items that may contain harmful substances. Additionally, their gastrointestinal tracts are more permeable than those of adults, which increases the likelihood and speed of absorption of ingested chemicals into the bloodstream.

While inhalation and dermal contact are also significant routes of pesticide exposure, especially in certain situations, ingested pesticides pose a greater risk for young children due to their behavior and physiological characteristics. Injection is less relevant in the context of typical accidental pesticide exposure scenarios.