DD (18 months) has also started biting. I have found that she is particularly worse when she is tired/sick or if there is a big crowd of people around - so usually a good combination for day care! you aqre doing every thing that you can and thats the main thing i reckon...THIS TO WILL PASS!

One thing that i have encouraged DD to do is bite her elmo (her soft toy) if she feels the need to bite and when she it hitting i get her to squeeze it in a big hug as hard as she can. This has definitely helped and i have noted that she is now biting less - not sure if it's a coincidence or if it ha actually helped! not sure if this is a good or a bad thing but it has helped so thought it worth a mention!!

good luck!