Why are infants and small children more susceptible to toxins?

• A. Developing bodies and higher intake relative to body weight
• B. Slower metabolism
• C. More stable detox systems
• D. Less exposure to environment

Answer: (A)

Infants and small children are more susceptible to toxins because their bodies are still developing and they take in more substance per kilogram of body weight. Their organs and detoxification systems aren’t fully mature, so liver enzymes, kidney clearance, and protective barriers (like the blood-brain barrier) may handle chemicals less efficiently, allowing toxins to affect developing tissues more readily. At the same time, young children have higher intake or exposure relative to their size—more air they breathe per kilogram, more food and liquids per kilogram, and behaviors such as hand-to-mouth activity—which means a given amount of toxin results in a larger per‑kilogram dose. Combined, ongoing development and greater per‑kg exposure make toxins more impactful in infants and small children.