Every baby is different and it depends on how quickly your baby grows. Our recommendation is for babies to stop using their Baby Box as a primary sleep space once they can pull themselves up independently. A baby who can roll, however, is perfectly safe inside his or her Finnbin, and the box will not tip over as long as it is on a flat, sturdy surface.If you purchase a Finnbin bundle - the clothes come in a variety of sizes from Newborn through 12 months of age and many of the products can be used throughout the child's infancy.