Webster's New World Medical Dictionary

breast reduction
Surgical reduction of breast
size in order to reduce the weight of the breasts and
relieve symptoms from unusually large, pendulous
breasts. Breast reduction can relieve skin irritation
of the chest, and pain in the back and shoulders.
Also known as reduction mammaplasty.
breast, Paget’s disease of
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breastbone
See 
sternum.
breastfeeding
The highly recommended prac-
tice of feeding an infant with the mother’s natural
milk. Breast milk contains vitamins, minerals, and
enzymes that aid the baby’s digestion, and immunity
factors in breast milk can help infants fight off infec-
tions. Breast milk can be expressed, manually or
with the assistance of a breast pump, for use while
the mother is away, or breastfeeding and formula-
feeding can be used together. The activity of breast-
feeding has strong benefits for mothers as well as
infants: It encourages the release of hormones that
improve uterine muscle tone, and it may help to
prevent breast cancer. The ability of the breast to
produce milk diminishes soon after childbirth with-
out the stimulation of breastfeeding. Also known as
nursing. See also 
lactation.
breathing
The process of respiration, during
which air is inhaled into the lungs through the
mouth or nose due to muscle contraction and then
exhaled due to muscle relaxation.
breech
The buttocks.
breech birth
Birth of a baby with the buttocks,
rather than the head, emerging first. Breech birth is
more likely to cause injury to the mother or the
infant than head-first birth. In many cases a baby in
the breech position can be turned before delivery by
using repeated, gentle massage.