A baby who has exclusively breast fed may reject the bottle at first. Below are some techniques we have found that may be of some help. Introduce breast milk or formula in a bottle. Have someone other than the mother give the bottle. Mother may even need to be in another room or out of the house altogether.
Nipples vary in size and shape.
Warm breast milk or formula to body temperature. You can test the temperature on the inside of your wrist. It should feel lukewarm. See Warming Infant Formula. Give extra love and cuddle time.