Babies go through clothes quickly, and unless you want to have your washer and dryer running constantly, you'll want to invest in several outfits to have available for wardrobe changes. It is recommended that you have a minimum of 15 onesies or infant bodysuits. These are worn under your baby's outfit to help keep your baby warmer and contain any explosive diapers. In addition to onesies, you should have at least seven sleepers or baby gowns on hand. It is highly recommended that you have this number of items available in your baby's current size as well as the next size up because they will wake up one day and be too big for their clothes. You don't want to be caught without an outfit to dress your baby in, so having the next size up is highly beneficial. This recommendation is based on doing laundry once per week and allowing for a minimum of two outfits per day, plus a pair of pajamas for each night of the week.