To use this onesie, simply put it on your baby. The bottom popper fastening makes it easy to dress and undress your little one. When it comes to maintenance, always remember to turn the onesie inside out before putting it in the washing machine. Use cold water for the wash and tumble dry on a low setting to keep the fabric soft and in good condition. For your baby's comfort, check that the onesie fits well and there are no loose threads. Avoid using harsh detergents as they can irritate your baby's delicate skin.