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.
Four more plates form a door which the barnacle can open or close, depending on the tide. When the tide goes out, the barnacle closes shop to conserve moisture. As the tide comes in, a muscle opens up these four plates, and the feathery legs of the barnacle sift the water for food.