TwinStar baby LLC is tested to the meet the ASTM F2236-14 / 16 CFR 1226-Soft - Structured Carriers, ASTM F2236-16a -Soft, Structured Carriers, CPSIA Section 101 and 103, and 16 CFR 1130 standards. TwinStar baby carrier “Tandem” was tested in 4 carry positions. Single Carry, Sling Carry, Front Carry Tandem and Front and Back Carry Tandem TwinStar baby is designed to tandem wear two babies of a max 35lbs each or a single baby up to 45lbs. We take safety very seriously and TwinStar baby meets or exceeds all safety standards. Please read all safety precautions and instructions before using TwinStar baby. If you have any questions or need assistance with TwinStar baby email: info@twinstarbaby.com or call: (808)756-9303 Hawaii PST