Here is how Emerald escaped in Emerald's Grand Day Out.
Emerald looks at the pictures from Baby's Day Out.
Baby Emerald: (happy gurgling)
Emerald looked at the pictures. Then, She saw a Pigeon.
Baby Emerald: (in her thoughts) Buh buh.
Emerald crawls to the Pigeon.
Cecil: (wakes up) Wh.. What? (gasps) Arthur! Arthur! Wake up!
Arthur: (still sleeping) No, Ma. I wanna sleep five more minutes.
Cecil: (slaps him in the head) Get up Artie!
Arthur: Huh? Oh, Morning, Cec. What time is it?
Cecil: Artie! The baby's gone!
Arthur: Where did she go?
Meanwhile, Dijon saw Emerald on the roof top.
Baby Emerald: (cross the roff with the plank her size)
Dijon: (climbing the Apartment with the Ladder attached to it) Don't worry, Little Emerald. Dijon is coming!
Baby Emerald: (crawling to the ladder attached to the other appartment)
Dijon: Okay, I'll get her on three. 1, 2, 3! (jumped but missed and fell right into a dumpster full of cardboards and broke his fall)
Baby Emerald: (slides down with the ladder going down and landed softly on Dijon loosing conscious)
Dijon: (dizzyly looking at Emerald) How many baby ponies are there?
Emerald crawled to the bus to Manehattan and stowaway in it.
Cecil: There she goes now, Artie.
Arthur: Cec, Do you think Klang and McGraw would be annoyed with us?
Back with Arthur and Cecil, Thaddeus E. Klang was ticked off.
Thaddeus E. Klang: (gets angry) You Incompetent Bird Brains! You've lost the Infant Unicorn!
Feathers McGraw: (aims his pistol)
Arthur: It wasn't our fault, Klang.
Cecil: Yeah, She must've escaped when we fell asleep.
Thaddeus E. Klang: Give us one good reason why should we spare the both of you!
Feathers McGraw: (pulls the trigger)
Arthur: Because we just saw her got into the bus.
Cecil: Yea, To Manehattan.
Thaddeus E. Klang: Follow that bus! And this time, No more mistakes.
Feathers McGraw: (disarm his pistol)
Arthur: Come on, Cec.
Cecil: Right behind you, Artie.
So, Arthur and Cecil flew off to Manehattan.