many women are inquisitive if their breast size can increase after 3o. Breasts contain breast tissue, conduits, lobules and fat tissue. one of the simplest and most effective ways on how to get bigger breasts without surgery is by gaining weight. However, this method is not feasible to all women, who by nature are weight conscious. Fortunately, there are many ways on how to get bigger breast without gaining weight. And these techniques are simple, affordable and easy to manage. weight gain is one possible reason why your breasts are getting bigger and continuing to grow. According to the mayo clinic, most women have the same number of milk ducts in their breasts. However, it is the amount of fat in your breast that determines their size. Weight gain and your breasts the fatty tissue in your breasts contain cells called adipocytes, which swell up when you gain fat and shrink when you lose fat. When you gain weight, you dont actually increase the number of fat cells in your breast -- the fat cells that are there simply get larger. Weight and height were measured at three screening rounds and waist and hip circumference was measured once. 6 of the women reported that they had to buy a larger bra because of changes in breast size, whereas 1. Weight gain, waist circumference, hip circumference, quetelets index at third screening, quetelets index at first screening, waist-to-hip ratio and years since menopause were significantly associated with increased breast. wt gain, baby or bra although weight gain or pregnancy are the natural methods of breast augmentation, these arent practical for the average individual.