This is a new video, replacing the previous one, which has been inexplicably removed from YouTube.
One of the common excuses for allowing a pet cat to give birth is 'I want my children to experience the miracle of birth.' If you are tempted to subscribe to this notion, spay your female cat and have your children watch this video first.
It might be best to preview it first, though and protect impressionable children from the final scene. The ending is heartbreaking, however, as the sympathetic producer of this video explains, it is about life and death