For those who continue to find comfort in their childhood blankie, it's considered healthy as long as the adult is still bonding and forming appropriate relationships with other humans.

The subreddit r/blankies (Link) is one of the most popular homes of the Blank Check fan community.

The blanket becomes an attachment object, an item familiar and comforting which can help the baby fall back to sleep or feel safe. The blankie is a soft, warm, and cuddly item which smells familiar and feels nice against your baby's skin. It is also something they can become very used to regardless of where they sleep.