1. This waistcoat has high elasticity and is not bound, including extending waist protection during pregnancy, preventing wind and cold, and expanding space with high elasticity throughout the range.2. It can be opened and closed by one hand through the mommy button, which is convenient for breast-feeding and easy to breast-feeding in one second.3. Skin-friendly comfortable fabric, soft and delicate touch, sweat-absorbing and breathable, as free as not to wear, protects mother's delicate skin.4. It can assist the breast to completely wrap and close, without steel ring, and bid farewell to the sagging breast.5. Adapt to the changes in pregnancy, do not press the chest, do not hold the abdomen, pull and release the button for 1 second, and do not wait for the breast-feeding baby to reduce the feeling of not feeling light support during weaning and prevent sagging