Primary teeth begin to erupt around 6 months of age (range 5-10 months).
Eruption is completed by 24 to 36 months.
Delays of more than 12 months merit further dental evaluation.
Eruption is usually symmetrical (lower teeth usually before upper) in the following pattern for the primary teeth: central incisors, lateral incisors, first molars, canines, second molars.
Falling out of the teeth.
often follows a similar pattern.