Size 1 fits for a "pre bump" size 2-4. From the brand's website: This onesie is sure to turn heads, whether you're bump-ed or just stylin. The Walkabout Jumpers short sleeve, slit-seam pockets and chic tapered 3/4 leg make it the perfect piece for comfort and style, while a zipper closure at back ensures that the fit wont disappoint either.
