Safety is the highest priority in children's apparel. You must ensure products comply with 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 cords and drawstrings to prevent strangulation. Additionally, look for OEKO-TEX® Standard 100 certification to guarantee the fabric is free from harmful substances, and ensure all small parts (buttons, sequins) pass a 90-Newton pull test to prevent choking hazards.