For those triggers that cannot be avoided, you can try to compensate with extra care in other ways. For example, when your child has a cold, you can try to ensure he gets lots of sleep and nutritious foods. Some triggers may become more of an issue as your child gets older.
barnacle. n. 1. (Animals) any of various marine crustaceans of the subclass Cirripedia that, as adults, live attached to rocks, ship bottoms, etc. They have feathery food-catching cirri protruding from a hard shell. See acorn barnacle, goose barnacle.
Biologist have observed barnacles in the laboratory taking as long as an hour to pick a location. In nature, barnacles may take days to find a suitable spot, investigating one area, then allowing the currents to carry them to another. After selecting a spot, the barnacle secures itself head-first to the surface with a brown glue. (This glue is so strong, the barnacle's cone base is left behind long after the creature has died.