The product Arc-shell hood, is designed based on aerodynamic technology. It provides average distribution of oxygen and carbon dioxide is expelled. The choice of delivery of aerosol and oxygen in various positions is enabled by dual oxygen port. The blowing over of oxygen directly to the patient is avoided by the exceptional design of diffuser. Oxygen circuit disconnection is avoided by lock-style connector. Injury of skin is eliminated and comfort is increased by the soft-foam neck pad. The light weight, transparent, arc hood enables easy observation of patient from any angle. The monitoring device of oxygen concentration and temperature connection is enabled by the extra port on the edge of hood. The air leakage risk by the motion of infant is avoided by the channel design and weight bar.