I can guarantee that the vast majority of rashes are simple chemical irritations caused by those perfumed and unnatural chemical mixtures in which disposable wipes are soaked. (celebritybabies.people.com)
Some may be related to the diaper itself, such as an allergic reaction or sensitivity to the dyes in diapers; chemical irritation from scented diapers, wipes, soap or lotions; the detergent used on cloth diapers; or texture irritation from the diaper material itself. (care.com)
MAS can affect the baby in a number of ways, including chemical irritation to the lung tissue, airway obstruction by a meconium plug, infection, and the inactivation of surfactant by the meconium. (ghanapoliticsonline.com)