The way baby and parents get started with one another helps the early attachment unfold. The days and weeks after birth are a sensitive period in which mothers and babies are uniquely primed to want to be close to one another. A close attachment after birth and beyond allows the natural, biological attachment-promoting behaviors of the infant and the intuitive, biological, care-giving qualities of the mother to come together. Both members of this biological pair get off to the right start at a time when the infant is most needy and the mother is most ready to nurture (see )
There is also no recommended time when baby sign language should formally stop. Gradually babies develop skills in their speech and language so they have no need to sign any more. There is no harm though in continuing to do it for as long as the baby and parents are happy to participate.