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Sebum, along with sloughed skin cells, makes up the waxy that covers newborn babies. Without this coating, babies would come out of the womb very wrinkled from the watery environment in the womb. Sebaceous glands often go into overdrive during puberty, much to the chagrin of teenagers.Sebum is an oily substance secreted by the sebaceous glands in mammalian skin. Its main purpose is to make the skin and hair waterproof and to protect them from drying out. An excess of sebum, however, can make the skin or hair oily, and it can begin to smell when broken down by bacteria outside the body.