Breast shields play a key role in pumping comfort and efficiency. Hands-free Breast Shields are extra breast shields for your Medela Hands-free collection cups - now also available with your Medela Hands-free breast pump. Be sure to examine your pump parts regularly, if you notice damage or extensive wear, replace immediately. Medela recommends replacing your breast shields every 3 – 6 months, depending on your pumping frequency.