I have a couple of books on herbs and children. There are some safe, gentle and effective herbs for babies. How old is your child? That will determine how much dry herb to use. Chamomile, mentioned earlier, is definitely one. You can also use lemon balm and catnip. I always make a strong tea out of it and give it to my child diluted throughout the day. It mellows things out a bit. There is also another homeopathic teething gel, can't remember the name, that helped us at night. The Highlands works well too.