Why did my milk supply decrease on one side?
Milk supply may decrease on one side for various reasons: the mother may be offering that breast less than the other, may be starting all feeds on the other side, or be expressing milk ineffectively on that side. Her baby may just prefer the other breast or may not feed effectively on the less active side. She may have one inverted nipple or had plugged ducts, mastitis, or an abscess. In these situations, the mother needs to make sure the baby is receiving enough milk. We recommend starting feeds on the breast that produces less milk. This ensures the baby stays interested in both sides. Most normal mothers have one breast that is slightly larger and more productive than the other.