Does the size of breast affect milk supply? Im size D, a had my babygirl 5 days ago was breast feeding but not a good latch so now i pump, i pump 10oz, 5 oz each breast!! I pump twice a day! Deffinetly way more milk then a 5 day old should be getting. But does anyone know what causes that or is it the size of breast when mine are full there probably more like triple ds