Breast Pump Uses Breast pump - number 45. Directions Use as recommended by physician, or lactation consultant. Place a warm compress on the breast for a few minutes before beginning to pump. Moisten rim of the horn. Squeeze the bulb, and place horn directly over nipple of breast. (Open end of horn collectorWarnings If bulb is not properly cleaned, the milk can become contaminated and cause serious gastrointestinal infections in newborns. Continuous use of breast pump may injure breast tissue. Do not place heavy or sharp objects on top of product. Do not steam or pun.