1, the fully open feeding mouth is designed, and its cup hook is hooked on the shoulder strap. When breastfeeding, the cup can be completely opened downward by pulling the hook ring to expose the whole breast. This design is generally better at home during leisure. Exposing the whole breast can also give the breast a proper breathing space, so that the breast can relax and not be trapped in underwear for a long time. 2. Open-hole breastfeeding opening design: when lifting the cup, only the nipple and the surrounding parts are exposed, so that the breast will not be cold or infected with bacteria, and the warmth is good. It is also good when going out or breastfeeding in public, and you will not feel embarrassed. 3, the front button breastfeeding opening design has designed an opening in front of the underwear, which can be untied with one hand, which is simply the greatest benefit for the troubled pregnant mother.