When sourcing kids' clothes stock, safety is the absolute priority. You must ensure products comply with CPSIA (Consumer Product Safety Improvement Act) for the US market or EN 14682 for the EU, specifically regarding small parts (choking hazards) like buttons and drawstrings on hoods or necks. Additionally, verify that the fabrics have OEKO-TEX® Standard 100 certification to ensure they are free from harmful substances like lead, phthalates, and formaldehyde, which are strictly regulated in children's apparel.