The immature skin.
Rutter
N
N
D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D012867:Skin / Q000033:anatomy & histology; D012869:Skin Absorption; D012879:Skin Physiological Phenomena; D014870:Water Loss, Insensible