We describe transepidermal water loss (TEWL) measurements in a collodi
on baby suffering from severe hypernatraemic dehydration and hypotherm
ia, who required intravenous fluid therapy in a special incubator. The
TEWL values 4 days after birth were abnormally high compared with nor
mal infants of the same age. The TEWL measurements returned towards no
rmal within the first month, in parallel with the improvement of both
the skin signs and the electrolyte and fluid balance.