When sourcing children's accessories, the most critical factor is chemical safety compliance. Ensure the PU (Polyurethane) material is Lead-free, Phthalate-free, and BPA-free. For the US market, products must comply with CPSIA (Consumer Product Safety Improvement Act) standards, while the EU market requires REACH certification. Always request third-party lab test reports (SGS or ITS) to verify that the synthetic leather and metal buckles do not contain harmful heavy metals that could cause skin irritation or toxicity.