Stu & Grandpa prepare a surprise birthday party for Didi. They had everything prepared except for one crucial element -- the birthday cake, which they forgot to get while rushing to get the party together. They take the Rugrats to Bob's Fully Automated Bakery to get the cake. While there, Tommy's gift to Didi, a frog, got away, prompting Dil to try and find it while the Rugrats try to rescue Dil before he becomes a cake. Meanwhile, Betty takes Didi to an English tea shop, where waiters sing songs for every occasion -- to the tune of ""Hail Britannia"".

So that Charlotte can conduct important business in peace, and so Drew & Stu can watch tennis, they tell Angelica that they'll buy a Cynthia Dream House and a mini sports car for her if she stays quiet. She ends up taking this ""quiet"" thing very seriously by not saying a peep, not even when the Rugrats pay a visit. Eventually, the Rugrats' racket ended up making her more angrier, with no way for her to vent her anger; also, her silence ended up affecting Charlotte's business deal, rather than helping it.

Kevin McNulty, one of Grandpa's old friends (and of course, related to Timmy and the McNulty boys), goes through the secret initiation in order to get into the Loyal Order of Wombats. After seeing this, the Rugrats have Dil go through something similar, so he could become one of the ""Big Babies"". In turn, their fathers mimic the Rugrats, on a bet that they could do everything the Rugrats do.