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Ibuprofen, the active ingredient in Advil, is not recommended for infants due to potential adverse effects on their developing bodies [1]. The U.S. Food and Drug Administration (FDA) has not approved the use of ibuprofen in children younger than six months old [2].

Ibuprofen can cause serious side effects in infants, including stomach bleeding and kidney problems [1]. Additionally, it may lead to a higher risk of developing a rare but serious condition called Reye's syndrome, which can cause liver and brain damage [1].

Furthermore, it is important to note that accurately measuring and administering the correct dosage of Advil for infants can be challenging, as it is typically based on the child's weight [3]. Overdosing can result in severe consequences, such as seizures, respiratory depression, and even death [3].

In summary, infants should avoid taking Advil due to the potential risks of adverse effects on their developing bodies, the lack of FDA approval for children under six months old, and the difficulty in accurately measuring and administering the correct dosage.

Sources:
[1] Drugs.com. (2022). Ibuprofen. Retrieved from <https://www.drugs.com/ibuprofen.html>
[2] U.S. Food and Drug Administration. (2019). FDA advises against use of prescription and OTC nonsteroidal anti-inflammatory drugs (NSAIDs) in children younger than 2 years. Retrieved from <https://www.fda.gov/drugs/drug-safety-and-availability/fda-advises-against-use-prescription-and-otc-nonsteroidal-anti-inflammatory-drugs-nsaids-children-younger>
[3] DrugPatentWatch. (2022). Advil. Retrieved from <https://www.drugpatentwatch.com/drugs/advil>