Alvin, Simon, and Theodore argue about their birthday. When they cannot agree, they ask Dave and he tells them that he doesn't know the exact date and that they always just celebrate it in the spring around the time he found them on his doorstep. Later that night, Alvin points out that their mother would know their birthday (and a lot more). The boys decide to set off to look for her, leaving the Chipettes to fill Dave in. The next morning, Dave finds the Chipettes cooking him breakfast in the kitchen. After they tell him where the Chipmunks went, Dave becomes worried and goes off to find them.
The boys had to do quite a bit of climbing. After being chased by a boar, they collaspe in front of a house (a hollowed-out tree) and are found by Ally, who was house-sitting for Vinny. When Vinny got back, she immediately recognized her boys.
The next morning, she had prepared them a breakfast of maple leaves, berries, and nuts, which the boys were not used to. When Alvin knocked the bowl of berries onto Theodore, Vinny asked him what the matter was. To which Alvin replies "What do you care?". He had a hard time believing that she really loved them since she had abandoned them as babies. Vinny explained to Alvin that she had had no choice. Alvin eventually forgives her after Vinny saves them from the wild boar.
- This special was the first appearance of the Chipmunks' mother Vinny.
- This was the other special based on the Ruby-Spears cartoon series, also appearing in syndication as a regular episode.