Examples of reflection. Plane wave, plane surface. The phase of the reflected sound waves from hard surfaces and the reflection of string waves from their ends determines whether the interference of the reflected and incident waves will be constructive or destructive.
The tendency to develop allergies is often hereditary, which means it can be passed down through genes from parents to their kids. But just because you, your partner, or one of your children might have allergies doesn't mean that all of your kids will definitely get them, too.
So your child is more likely to have it if you or a close family member has had eczema, asthma, or allergies. Eczema is not an allergic reaction to a substance, but allergens or irritants in the environment (such as pollen or cigarette smoke) can trigger it. Less frequently, it can be triggered by allergens in your child's diet â or in your diet if your child is breastfeeding.