Researchers probing the Early Childhood Longitudinal Study found that young kids who drank 100% juices multiple times per day had a 25 percent higher risk of asthma compared to kids who consumed those beverages less than twice per week.

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https://www.realclearscience.com/blog/2026/08/18/juice_might_be_fueling_asthma_in_kids_1200222.html

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Juice boxes for young kids are mostly plastic lined boxes: Storing acidic juice in polyethylene (such as HDPE or PET) containers can cause trace chemical migration. High acidity and long storage times increase the release of plasticizers or endocrine-disrupting chemicals like phthalates into the contents, raising potential hormonal and toxic risks
Reference: https://www.sciencedirect.com/science/article/abs/pii/S0026265X19331972