4- Symptoms and development of infant teeth between 4-7 months

Most babies develop their first teeth between four and seven months, but some may develop their teeth as early as 4 months.
The exact cause of early eruption and risk factors have not been determined, however it is believed that the teeth that erupt at the age of three months are only primaries that developed earlier than normal.
Signs of teething in children at the age of three months..such as: excessive drooling..putting fingers and objects in the mouth..swelling of the gums..irritability..breastfeeding pain..loss of appetite..sleep deprivation.