If you need to feed your baby expressed milk then check out the reasons why you should use a paced bottle feeding technique. (expressing-mama.com)
As for the 100 % silicone nipple, it focuses on the softness and flexibility to allow the baby to use similar feeding technique as s / he would when being breastfed. (followmum.com)
We used the dream feed technique for several months (on three different babies) with great success. (rookiemoms.com)