If you are making kefir every day, your grains should be growing and multiplying. If they aren’t, it is because the temperature in your house is cooler than usual, slowing down the grains, or your kefir grains have died. If your milk is turning into kefir by becoming sour and thick, your grains are still working, just at a slower rate. You can purchase more or get some new grains from a friend.