What is the size of a cottontail when it's a baby and adult?

Baby cottontails, also known as kits, are typically born weighing around 1 ounce and measuring about 4-5 inches in length. As adults, eastern cottontails can grow to be about 15-18 inches long and weigh between 2 to 5.5 pounds, depending on factors like age and habitat. Their size can vary slightly among different cottontail species.