Onesies are a type of infant clothing that is designed as a one-piece outfit that covers the entire body. However, the word "onesies" is trademarked by the company, Gerber. Therefore, other companies use alternative names for this type of clothing. These synonyms for onesies include bodysuits, rompers, babygrows, sleepers, and jumpsuits. Each name indicates the design and function of the clothing, with bodysuits emphasizing the form-fitting design, rompers and jumpsuits highlighting the free-moving nature, babygrows suggesting that babies grow fast and need adjustable clothing, and sleepers emphasizing comfort during sleep. Ultimately, whether it is called a onesie or an alternative name, this type of infant clothing remains an essential item in any baby's wardrobe.