M.K.
Here are a few tips, make sure whatever you do it is kept consistent, and yes, the biting is normal. You shoudl try to get into your daughter's head when she bites, is it because she is trying to communicate something? She may feel excited, mad, stressed out, tired, or really any emotion and that is how she is expressing it to you. My daughter used to bite when she was mad, I taught her to instead tell me she is mad and that stopped the entire issue. She only bit for about a week and she is 27 months now.
1. Show your child by your tone and expression that biting is not acceptable.
2. Remove the child from the situation immediately.
3. Do not, under any circumstances, bite your child back.
4. Provide teething rings, teething biscuirts or cold washcloths for children who are teething.
5. Look for consistencies in the biter's environment and emotional state at each episode. Is the child tired or hungry? Has there been a change in his/her routine?
6. If you see your child becoming frustrated, intervene and get him/her involved in something positive.
7. Work with your child on building communication skills.
8. Make sure your child is getting adequate sleep for his/her age and try to maintain a schedule.
9. Give plenty of praise when he/she handles tough situations in a positive way.
10. Be sure you are giving your child plenty of attention.
Adding on:
While you need to firmly tell your child that biting isn't okay, actually punishing him for the behavior isn't very effective at getting him to stop. In fact, punitive measures may put an angry or overstimulated child right over the top. And though parents are often counseled to bite their child back "to show him how it feels," this is as pointless as it is painful.
A child this age isn't capable of truly putting himself in another's shoes, so he can't yet see the connection between what he does and what's done to him. What's more, young children do most of their social learning by following their parents' example, so biting your child or otherwise inflicting pain on him sets an appallingly bad example. After all, how will he learn that biting is beyond the pale if you do it, too?
Biting must be stopped, of course, but you won't stop it by stooping to your child's level. Aggressive acts stop when adults stop them. So instantly remove your child's teeth from his victim's flesh, show concern for the child who's been hurt, acknowledge both parties' feelings, and, as your child's verbal skills grow, help him learn to negotiate with words rather than aggression: "We don't bite (or hit or grab). Can you use your words to tell me what you need?"