Opal,

I have a 17 month old nursing toddler who has chipping enamal only on his
front two upper teeth.  He has 7 other teeth which have no problems.  He
nurses about the same amount as the 13 month old that you mentioned.  I took
my son to 2 dentists and was told that the teeth did not form properly and it
has nothing to do with nursing.  I have been applying flouride every 3-5 days
and using a cloth to clean them.  Using a toothbrush causes more enamel to
come off of the tooth.  My son does not seem to be in pain or sensitive to
hot and cold.  I take him to the dentist every 6 months just to keep an eye
on his teeth.  Hope this info helps.

Helen Schieve LLLL