Why is baby skin more vulnerable to chemicals in clothing?

Infant skin is structurally different from adult skin in ways that increase chemical absorption. The outermost skin layer (stratum corneum) is thinner and less developed in babies, allowing chemicals to penetrate more easily. A baby's skin-to-body-weight ratio is approximately three times higher than an adult's, meaning the same amount of chemical exposure represents a proportionally larger dose relative to their body size.

Babies also have a less mature skin barrier with higher transepidermal water loss, which indicates gaps in the protective lipid layer that normally helps block chemical penetration. This is especially true for premature infants. Combined with hand-to-mouth behavior, where babies routinely suck on sleeves, collars, and fabric edges, both dermal and oral exposure routes are active.

These physiological differences mean that choosing chemical-free clothing for infants is not overcautious but medically prudent. Every garment that touches a baby's skin should be free from formaldehyde, PFAS, azo dyes, and flame retardants. ONDU recommends GOTS-certified and OEKO-TEX Class I products as the minimum standard for infant clothing and bedding.