Why is colostrum a boon to the new born baby?

Why is mother’s milk considered the most appropriate food for a new born infant?
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Why is colostrum a boon to the new born baby ?

Mother’s milk is considered most appropriate or a boon for a newborn infant as it provides immunity in the initial period of baby’s life. The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.

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It also provides passive immunity