Children generally develop their teeth before birth. Eruption starts at about six months, usually with the appearance of the lower incisors, and is complete by about two-and-a-half years. The table below will show an estimate chronology of tooth development:

Baby teeth	Calcification begins	Appearance
Incisors	4 mo (fetal life)	6-9 mo
Canines	5 mo (fetal life)	16-18 mo
1st Molar	6 mo (fetal life)	12-14 mo
2nd Molar	6 mo (fetal life)	20-30 mo

Permanent teeth	Calcification begins	Appearance
Lower incisors	3-4 mo	6-8 yrs
Upper incisors	4-5 mo	7-9 yrs
Lower Canines	4-5 mo	9-10 yrs
Upper Canines	5-6 mo	11-12 yrs
Premolars	1.5-2.5 yrs	10-12 yrs
1st Molars	Birth	6-7 yrs
2nd Molars	2.5-3 yrs	11-13 yrs
3rd Molars	7-10 yrs	17-21 yrs