Compliance is the most vital factor in children's apparel. You must ensure products meet CPSIA (Consumer Product Safety Improvement Act) for the US market, which regulates lead content and phthalates, or EN 14682 for the EU, which focuses on the safety of cords and drawstrings to prevent strangulation. Additionally, look for OEKO-TEX® Standard 100 certification to guarantee the fabric is free from harmful substances, and GOTS (Global Organic Textile Standard) if you are sourcing organic cotton products.