Simultaneous bilingualism in children involves acquiring two languages from birth. Research shows that children can learn two languages with little confusion between them. The process has two stages - initially languages are undifferentiated in the child's mind, but they later differentiate the grammars, vocabularies, and other features of each language. Studies found that bilingual children sometimes make minor mistakes but understand the syntax of each language. They are also able to distinguish different phonemes and control code mixing between languages without confusion. Learning two languages simultaneously is easier for children than adults and provides cognitive advantages.