1.This vest can be opened and closed with one hand by mommy button, convenient breast-feeding upper button design, easy breast-feeding in one second. 2.Skin-friendly comfortable fabric, soft and delicate touch, sweat-absorbing and breathable, as free as not wearing, close care of mother's delicate skin. 3.High elasticity does not bind, including extended waist protection during pregnancy to prevent wind and cold, and full range of high elasticity to expand space. 4.Wrap and close the auxiliary breast completely without steel ring to bid farewell to 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 during breastfeeding, and do not wait for the breast-feeding baby to reduce the feeling of not feeling light support during weaning to prevent sagging