Compliance is the most critical factor. For the US market, products must adhere to CPSC 16 CFR Parts 1615 and 1616, which regulate the flammability of children's sleepwear. This often requires either flame-resistant chemicals or a 'tight-fitting' design to reduce fire risks. For the EU, EN 14878 is the standard. Additionally, ensure all materials are OEKO-TEX® Standard 100 certified to guarantee the absence of harmful substances like lead, phthalates, or formaldehyde, and comply with CPSIA tracking label requirements.