What a Caul is not
There are many misconceptions about the exact description of a caul. Other phenomena which are often mistaken for a Caulbearer birth are as follows.
Some children are born while still enclosed within the amniotic sac or membrane, the amnion, which surrounds the newborn. This usually entails the child being born with a sac of transparent or translucent membrane surrounding all or part of the child. This phenomenon is referred to as being born "en-caul", which is the medical term for such births. This is not a Caulbearer birth, and is one of the most commonly held misunderstandings of being born with a caul, as the word caul may often be used to describe the concept of a covering or lining. Some dictionaries refer to a caul as being a bonnet or cap.
This meaning of covering or cap also gives rise to another phenomena of being born with the lucky cap, which is what happens when a child is born with placenta or some afterbirth material being found stuck to the head or face. Once again, such births have no relevance to a Caulbearer birth as a genuine caul is quite distinctive, and is a full face covering, something like a thin mask.