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What does Onesie mean?

ONESIE 

1. An onepiece article of clothing for a newborn child or little youngster, by and large worn over a diaper 

2. Onesie or onesize is American English for a bodysuit for newborn children intended to cover a diaper when worn. It is likewise called a creeper, diaper shirt or snapsuit. The British English proportionate is babygro. Onesie is a genericized trademark to Gerber Childrenswear Inc., which keeps on safeguarding its trademark. Babygro is additionally a trademark brand, developed in the U.S. in the 1950s by Walter Artzt