The best time and method for girls to choose a bra in their life. Many people think that they should wear a bra in time when their breasts swell, while others think that they should wait until the postpartum breasts secrete milk. In fact, these ideas are unscientific. So, when should I start wearing a bra? At present, it is considered that it should be based on the speed and size of breast development The development of breast is influenced by many factors, such as heredity, nutrition, exercise and so on. At the beginning of puberty, the breasts are fully developed, and the method of binding the breasts should not be taken to hinder their development. Generally, when a girl reaches the age of 16- 18, the development of the chest gallery and breasts is close to maturity, or the distance from the upper bottom of the breast to the lower bottom of the breast is more than 16cm with a soft ruler. If the age is less than 16 years old and the distance between breasts is less than 16cm, it is not suitable to wear a bra. Because wearing a bra too early is not only bad for developing breasts, but also affects future milk secretion. But if you don't wear a bra after the breast is fully developed, it is also unfavorable for breast development. Because bodybuilding breasts need special protection, it is an ideal and simple way to wear a bra in time. Wearing a bra can protect the breast, support and foil the breast, make its blood circulation smooth, and contribute to the development of the breast; Can reduce the breast swing when walking, exercising and working, and prevent breast sagging; It can promote the accumulation of breast fat, make breasts fuller and make up for the physiological defects of too small breasts. Wearing a bra can not only reflect the unique curvaceous beauty of women, but also be beneficial to human health. However, improper use will also affect human health. Therefore, it is necessary to choose a bra scientifically. At present, there are many kinds of bras on the market, which can be selected according to their body shape, fat and thin, season and breast development. It is best to choose soft, breathable and moisture-absorbing cotton products. The length of the bra shoulder strap should also be appropriate and wider (not narrower than 2-3 cm). The ideal bra should just be able to hold up the breasts when the human body is active, and limit the activities of the breasts as much as possible without affecting breathing. There should be no signs of oppression on the skin after taking it off. Therefore, when you go to the store to buy a bra, you must first measure the bust, that is, measure it around the bust with a soft tape measure along the lower edge of both breasts. This is the size of the bra you want to buy. The size of the bra should be moderate. If it is too small, it will compress the breasts and nipples, affecting the development of breathing, thorax and breasts. However, if the bra is too big, it can't support and protect the breast. In addition, the bra should be taken off when sleeping, so as not to affect breathing and blood circulation. According to the body shape, the bra cups suitable for you can generally be divided into three types: full cup, 1/2 cup and 3/4 cup. Full-cup bras can completely incorporate breasts into cups, which is suitable for women with full and soft breasts; 1/2 the size of a bra with a full cup is roughly 1/2, and the shoulder strap can be removed to become a strapless style; The 3/4 cup, that is, the oblique cut style, can completely incorporate the breast into the bra and also show the cleavage. Full selection: full cup without pad or thin pad, supporting the whole chest, feeling comfortable and stable. The shoulder strap is thick, which prevents the thin shoulder strap from forming dents on the shoulders due to heavy falling force. Slim choice: add a steel ring inside the cup and a thicker lining below. "Side bone" design, that is, soft rubber strip is embedded in both armpits, can help push the muscles on both sides into the cup and enhance fullness. Adjustment and selection: Waist and abdomen have fat: If the chest is large at the same time, the style with overall decorative function is most needed. The chest is flat and messy, and the muscles are soft: a small and deep cup, with a thick cotton pad at the lower part, creates a tall and straight nipple. Body posture is not straight enough: the combination of functional lining and shoulder strap at the lower part of the cup gently presses the bones on both sides of the chest, raises the chest and adjusts the chest and overall posture. Protruding breasts and fleshy underarms: the front button design makes it easier for the breasts to fold to form cleavage, and the underarm reinforced lining effectively tightens the fat on the ribs. Chest prone to sagging: there is a solid seal on the outside and a steel wire on the lower edge to consolidate the support. Sports choice: breathable texture. The cup is bigger. The top and bottom of the cup should have a mesh design to enhance the ventilation and heat dissipation effect. The lower edge of the cup is inlaid with a soft ring to increase the support. There is a thick rubber band at the lower edge to assist the supporting function of the cup. Best wearing action: 1. Put your shoulder strap on your shoulder and lean forward. 2. Put your hands under the cup and put the breast completely into the cup. 3. Fasten the buckle on the back with both hands. Straighten the upper body and push the muscles around the cup into the cup. Adjust the length of the shoulder strap to make it moderately elastic. Front button: 1, lean forward and put your arms through the shoulder strap. 2. Put the breast completely into the cup. 3. Button the front button, and then push the muscles around the cup into the cup. Off-the-shoulder type: 1, lean forward and fasten it. 2. Put the breast and peripheral muscles into the cup completely, then stand up straight and adjust the position of the lower edge of the cup. Move slightly to ensure that the bust does not shift.