Since around week 20 a white cheese-like substance known as vernix has started to cover your baby’s skin. This protective layer is thought to protect the skin from prolonged emersion in fluid. In addition it is suggested that the substance has antimicrobial properties that protect the baby against infection. As the next few weeks come and go the amount of vernix on the baby will decrease but, unless your baby is very late in arriving there will still be some visible after birth. Don’t rush to wipe it off as it is though to be very beneficial to baby.
That said, if you baby has had a poo inside this vernix may have a yellowy-green appearance – it this case you will probably want to wipe it off!