A whitecoat is a newborn harp or grey seal with soft, white fur. ==From newborn to whitecoat== Newborn seals have yellow fur because of amniotic fluid, and are still wet. When the pup dries, it is called a yellowcoat. The amniotic stain fades and the fur turns white within a few days, and it gets the name whitecoat. First it`s called a thin white....
white-furred seal pup
• (n.) The skin of a newborn seal; also, the seal itself.
White'coat` noun The skin of a newborn seal; also, the seal itself. [ Sealers' Cant]