Wild Spring Babies

It is April so could we be seeing wildlife babies soon? Are wildlife of the same species born at the same time in Illinois? (the point of this question, or one like it, is to point out the length of our state and that wildlife births could differ because of timing of “spring”) What are the first considerations a person should have when they find what seems to be a wild baby animal in need? What is one of the most common wild species people are concerned about each spring? What are other animals often rescued when they didn’t need to be? Are there any larger animals people worry about when they find them?