What are the main safety warnings for using this carrier?

Never leave a child in the carrier unless being worn by a caregiver as the child may fall, suffocate, or strangle. Never bend at the waist when wearing the carrier—always bend at the knees. Never use the carrier while driving or engaging in activities involving heat sources or chemicals. Do not strap the infant too tightly against your body, as infants under four months can suffocate if their face is pressed tight. Always keep the infant's face free from obstructions and allow room for head movement.