birth mother noun

The mother who gives birth to the child (as contrasted with an adoptive or a genetic mother)

birthˈnight noun

1. The night on which one is born, or the anniversary of that night
2. The evening of the sovereign's birthday (obsolete)

birth parent noun

1. A natural parent (as contrasted with an adoptive parent)
2. A birth mother or her partner (as contrasted with a genetic parent)

birth pill noun

A contraceptive pill

birthˈplace noun

The place of one's birth

birth rate noun

The proportion of live births to population

birthˈright noun

1. The right or privilege to which one is entitled by birth
2. Native rights

birth sign noun

The sign of the zodiac under which one was born

birthˈstone noun

A gemstone associated with one's birth sign

birthˈ-strangled adjective (Shakespeare)

Strangled at birth

birth weight noun

A baby's weight at birth

birthˈwort noun

A plant (Aristolochia clematitis) formerly reputed to help parturition

give birth

Of a mother, to bear or produce a baby