In the early years, I would encourage parents to put together annual plans for their child's sports schedule. It's helpful to research the sports early enough to not miss registration deadlines and it's also nice to see when a child may be participating in too much at once.
I put together a bi-monthly plan for each of my kids and then look week by week to see where the seasons overlap. Certain sports like tennis, ballet, equestrian and swimming that don't need to occur in particular times of the year (there is some flexibility as to when you do them) serve as nice offseason sports to other sports like football, baseball, lacrosse, hockey, and skiing which have very defined seasons.
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