A pinch of salt.

Pregnant women in labour are generally encouraged by their carers to continue taking plenty of oral fluids. This is sometimes supplemented by intravenous fluids either due to a clinical necessity or in preparation for a caesarean section. It is important that there is clear documentation of the amount of fluids received by pregnant women in the perinatal period as excessive maternal fluid has been associated with low serum sodium in neonates. This often goes under-recognised; therefore it is important to consider this in a neonate presenting with hyponatraemia in the first day of life. Presented here is a case of neonatal hyponatraemia secondary to excessive fluid taken in the perinatal period.