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Internal use of eucalyptus globulus is avoided in infants and young children because the plant’s essential oil is highly potent. The main constituent, 1,8-cineole, can cause serious toxicity in little ones even at small amounts, leading to symptoms like nausea, vomiting, abdominal pain, dizziness, lethargy, seizures, and, in severe cases, respiratory depression or failure. Infants have still-developing liver and nervous systems, and their airways are more sensitive, so the risk of adverse effects is significantly higher. Because of this safety concern, internal use in this age group is contraindicated. The other herbs listed do not carry the same level of internal-use risk for infants, so they don’t carry the same contraindication in this context.