Funny Onesies For Babies. "What Happens In Vegas Doesn't Always Stay In Vegas".  We use very soft 100% cotton baby clothes that's gentle on your baby's skin. It's recommended to wash the onesie inside out in cold water for the first time. These baby onesies come in short or long sleeve and are great for Baby Showers, 1st Birthdays or just putting a smile on someones face.