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Bodysuit, onesie, vest, sleepsuit, babygrow, romper, footie — baby clothing terms are genuinely confusing, and they change between the US and UK. Here’s what each item actually is, when to use it, how many you need, and how they all work together.

A baby’s age tells you surprisingly little about what size they actually wear — weight and height tell you far more. Here’s a clear baby clothes size chart, why brand sizing varies so much, the practical rules that save money, and how to tell if something really fits.