how early does teething start in children   

Normally the baby starts getting his/her first teeth during 4 to 6 months of the age. If the overall growth of the baby is normal and the process of teething does not start till 12 to 15 months, it is okay to wait. In some babies, there is a delayed occurrence of teething and it is not a cause of concern. Teething usually can continue up to 3 years.