Cat suckling can occur when cats suck on their nipples, other areas of skin, their thumbs and other objects.
The causes of cat suckling can include being separated from cat mom too early. Ideally, kittens should not be separated from their mom earlier than six weeks. According to ASPCA, suckling can also be a sign of stress, compulsive behavior, or even just happiness or contentment.
The kitten in the video below can’t sleep without his security thumb! We don’t know his story but he definitely doesn’t look unhappy. He looks very relaxed in his human’s arms and he is totally adorable!