Maternity refers to the period of motherhood. It is period refered usually to the period after childbirth where child-care is at its peak. The main objective of this phase is too provide as much child care as possible in order to maintain the childs nutritional upbringing, psychological stabilty etc.
Now in the period after child birth, the mother is usually weak and fragile and lacks capacity to perform everyday household chores which she otherwise would have.Hence maternity is a period of tight regulation and constant vigilance over both mother and child in order to provide for nutritional adequacy and psychological stability.