The cocoon thing is called a sleep sac .... I've had a few who used them when they started here and I quickly transitioned them out of it (usually within a month its gone) .... Generally for a full time child it takes about 2-3 weeks to transition but part time and one who's parents have really done nothing to prepare them probably longer.... It will depend if the parents are going to help or if they are going to continue to coddle.