PLS NOTE!!!
TEETHING does not cause fever, diarrhea, diaper rash, ill appearance or lowered resistance to infection.
CAUTION!!! Blaming teething for fevers can lead to a delayed diagnosis of ear infections, urinary tract infections, meningitis and other infections.
CAUTION!!! Blaming teething for crying can lead to a delayed diagnosis of ear infections or other causes of pain.

Teething usually begins around 6 months of age. But it is normal for teething to start at any time between 3 months and 12 months of age.
For symptoms;
Some babies are fussier than usual when they are teething. This may be because of soreness and swelling in the gums before a tooth comes through. These symptoms usually begin about 3 to 5 days before the tooth shows, and they disappear as soon as the tooth breaks the skin. Many babies don't seem to be affected by teething.

Kindly note that teething is a normal physiological process