US Customs and Border Protection generally follows the convention that 'babies'' garments are those sized for children up to approximately 86 cm in height (roughly age two). Garments above that size threshold are classified under the appropriate children's or boys'/girls' heading. When sizing is ambiguous, the garment's label, manufacturer's size chart, and retail presentation are reviewed.

Bibs are clothing accessories and are explicitly included in heading 6209 when woven and sized for babies. They are not classified under the made-up textile articles heading. The fiber content determines the subheading — cotton bibs fall under 620920, synthetic fiber bibs under 620930.