Answer:
Sequential bilingualism occurs when a person becomes bilingual by first learning one language and then another. The process is contrasted with simultaneous bilingualism, in which both languages are learned at the same time.
There is variation in the period in which learning must take place for bilingualism to be considered simultaneous. Generally, the term sequential bilingualism applies only if the child is approximately three years old before being introduced to the second language (L2).
