Teeth that are present at birth are natal teeth, and teeth that emerge through the gingiva during the first month of life are neonatal teeth. According to Chandeswar of Muhurta Chintamani -
In case of natal teeth or neonatal teeth (teeth in the first month), the baby herself dies. In case of teeth in second month - younger brother, third month - sister, fourth month - mother, fifth month - the baby kills her elder brother. In sixth month - Atula yoga, seventh month - prosperity through the father, eighth month - healthy body, ninth month - money and tenth month - baby gets gain, eleventh month - happiness, and twelfth month - financial gains.
The natal teeth are indication of death to the baby or the parents.
In case of inauspicious teeth, it is recommended to perform appropriate remedies.
Note: I am not the beliver of any of these concepts and pubishing it here just becuase people look for it on Internet. I think this is also another way for pundits to make money by scaring parents.