How to massage a baby's teething gums in four easy steps. Use the pad of your fingers to rub in a circular motion all along the gum line. You can do this both inside and outside the mouth. When you do it inside the mouth, use the pad of your finger and just rub it all over the gum. Rub the baby's gum back and forth. Rub the bottom gum, front of the gum and the top of the gum. Just rub all around the gum and you might also feel if there's a teeth coming out.