La Petite Ourse swim diaper will grow with your baby. Along with its waterproof exterior, it has 3 layers of bamboo to help absorb small messes.  You’re looking to use these as training pants? Simply add any insert in the pocket and you're done! Features: Adjustable snaps to fit baby's waist Can also be used as a training pant Specifications: Available in 2 sizes: 13-25 lbs and 20-35 lbs Exterior is 100% polyester Bamboo insert: 80% bamboo, 20% polyester Care Instructions: We recommend washing the diapers and inserts twice before using them for the first time. This allows the fabric to gain maximum absorption and to get rid of the sewing threads that would have remained stuck during manufacturing. Rinse with cold water: Helps get rid of any residue Regular wash cycle: Warm water cycle (40º) Do not put too much water in the washer. The diapers must rub against each other. If you have hard water, do not rinse a second time; use a powder detergent instead Do Not Use fabric softner or baby detergent (it is not concentrated enough to properly wash the diapers)