How often should you replace the nipples?
If your baby grows comfortable with one certain nipple, he or she may object if you change to a new one.
Rotate the use of 2 or more nipples for about 2 months before replacing them.
To prevent the nipples from becoming worn out, replace them earlier if necessary, without regard to how many times they have been used.
The nipples may be worn by biting.
Special attention is needed for teething child.