Eruption of primary teeth
With a few exceptions, babies are born without apparent teeth in the mouth. But this does not mean that the teeth are non-existent; the development of teeth starts inside the womb during the first weeks of life.
The eruption of the first teeth (the primary dentition) stretches over a period of around three years. Sometimes, infants have one or a few teeth at birth; we then talk about a premature eruption. This situation is not alarming, but vigilance is required to prevent injury to the tongue or the mouth.