AATC Elaborations: How do The Chipmunks have separate birthdays? (200 subscriber special)

One lesser talked about mystery from the 2015 Alvinnn!!! and The Chipmunks series is how the Chipmunk and Chipette characters have individual birthdays from each other in separate episodes. Especially considering how they've always been depicted at sets of triplets in the past, and the conflicting evidence of whether they still are. All images used in this video are intended for use in a way that qualifies under Fair Use for the purposes of education and critique.