Actually yes, a comforter (such as a blankie or soft toy) helps your baby to sleep. They can help babies and toddlers feel more secure when they are away from their parents. For this reason, they are sometimes referred to as transition objects. When your baby or toddler is away from familiar people and surroundings, they provide feelings of comfort and security that help him or her transition from one state to another (e.g. waking to sleep). These comforters help your baby feel safe, calm, and happy, so regardless of how worn and grubby they look, you shouldn't discourage them. This is actually evidence that your baby is growing up and learning how to cope with independence.