Short-lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is categorised as?

Immunity is transferred across the placenta from mother to the foetus or through the mother's breast milk to the infant passively in the form of readymade antibodies which can provide protection against bacteria and viruses until the baby can synthesize its own antibodies. Therefore, it is a short-lived immunity. The World Health Organization recommends that breastfeeding must be given for the first two years of life to provide immunity to the child. This kind of immunity which is transferred directly in the form of readymade antibodies is called passive immunity. So, the correct answer is 'Passive immunity'.