Warm reminder for baby strollers

Why do many baby strollers have a minimum backrest angle of 175 degrees instead of 180 degrees and lie completely flat? Because the design of the angle of the baby stroller needs to consider its safety. If lying flat at 180 degrees, the baby is prone to choking due to vomiting; Secondly, when pushing the cart against the wind, the baby's nose is prone to inhaling cool air; During the process of pushing the cart up the hill again, the possibility of the baby sliding out of the top of the cart increases. Between the above three points, the minimum angle of the backrest of the cart is 175 degrees, which is the safest.