Using this baby onesie is super easy. Just put it on your little one through the bottom poppers. When it comes to washing, remember to turn it inside out and use cold water in the machine. Then, tumble dry it on a low setting. Keep in mind that since it's made for your baby's delicate skin, avoid using harsh detergents. Also, check the poppers regularly to make sure they're in good condition so that your baby stays comfortable and safe.