Why timing changes the plan
A standard exclusion lets animals leave through a one-way door and keeps them out. That works for adults. But babies can't leave on their own, and if the mother is shut out, two bad things happen: the babies die in the attic and cause odor and flies, and the mother chews or rips a new hole trying to get back in, often bigger than the first.
When babies are present, we locate the nest, carefully remove the young and let the mother retrieve them or reunite the family outside, and then complete the exclusion and sealing. With raccoons especially, a mother will move her kits to a new den once she's disturbed, which is why careful planning matters. We're licensed by the NJ Division of Fish and Wildlife and use exclusion, never trap-and-relocate.