Abstract: A system for feeding infants with an artificial formula includes the supply of a formula (20) into a bag (10) under sterile conditions. The bag (10) is not completely filled with formula (20), the formula (20) occupying one portion (12) with another portion (14) being collapsed as a result of withdrawal of air therefrom. The bag (10) is sealed. In use, the collapsed portion (14) of a bag (10) is inserted into a nursing bottle (16) and the formula (20) caused to flow into the collapsed portion (14) located within the bottle (16). The former filled portion (12) is removed to provide an opening to the formula (20) in the bag (10), and the free end is located between a cap (26) holding a teat (28) and the neck (18) of the bottle (16). The formula (20) may have an increased initial vitamin content to allow for loss of vitamins during storage.