Many babies and children like to fall asleep while being carried and can easily spend a large part of the day in the sling or carrier. This is perfectly okay! As long as both the wearing adult and baby are comfortable, there is no such thing as too long. Naturally, over the course of the day, children are taken out of the sling or carrier for nappy changes and feeding. Riding in a car or on a bike are not appropriate when you're wearing your baby.