Baby's milk teeth start to erupt around 4 to 7 months. In practice, it is more like the 5th or 6th month, or later, only exceptionally in the earlier period of development. It manifests itself in the baby's nervousness, increased salivation, crying, discomfort, impaired sleep and possible temperature. Swollen and reddened gums can also be a sign of teething. The total growth of milk teeth takes up to 2.5 to 3 years, sometimes longer. The number of milk teeth is 20.