The best food for the infant is the food that nature provides. Of this it should not be needlessly deprived. It is a heartless thing for a mother, for the sake of convenience or social enjoyment, to seek to free herself from the tender office of nursing her little one. CCh 140.4
The period in which the infant receives its nourishment from the mother is critical. Many mothers, while nursing their infants, have been permitted to overlabor and to heat their blood in cooking; and the nursling has been seriously affected, not only with fevered nourishment from the mother's breast, but its blood has been poisoned by the unhealthy diet of the mother, which has fevered her whole system, thereby affecting the food of the infant. The infant will also be affected by the condition of the mother's mind. If she is unhappy, easily agitated, irritable, giving vent to outbursts of passion, the nourishment the infant receives from its mother will be inflamed, often producing colic, spasms, and in some instances causing convulsions and fits. CCh 140.5
The character also of the child is more or less affected by the nature of the nourishment received from the mother. How important then that the mother, while nursing her infant, should preserve a happy state of mind, having the perfect control of her own spirit. By thus doing, the food of the child is not injured, and the calm, self-possessed course the mother pursues in the treatment of her child has very much to do in molding the mind of the infant. If it is nervous and easily agitated, the mother's careful, unhurried manner will have a soothing and correcting influence, and the health of the infant can be very much improved. CCh 140.6