They usually have the urge to bite down on things when they are teething. Your pediatrician can recommend pain relievers for babies if the pain gets worse. Sing to your baby as well. Not only does this help the baby, but it also helps to relax you as well. If your baby doesn't like your singing, play some soft music and hum along to the music.
Nature sounds work well with many babies.
There are audio tapes and CD recordings of various nature sounds available on the market. There are also some toys for newborns and older babies that play nature sounds. This could indicate an ear infection and it should be treated right away. The most important thing to remember is to try and stay calm yourself. Some studies have shown that babies can sense what their parents are feeling so if you are not calm, then it will be harder for your baby to relax.