A 6 months old child does not have any tooth in mouth. Normally by what maximum age first tooth should erupt.
In primary dentition the variation of eruption has a range of 4-5 months, Since first tooth erupts at an age of 6 months then a variation of 4-5 months can be considered normal.
10 to 11 months
6 to 8 months
14 to 16 months
All of the above