When You're Small is a song consisting of a montage of things one can do when small, as Phineas, Ferb, Buford, Isabella, Baljeet, and their new friend, Irving, enjoy being shrunken in size, in order to play "Hide and Seek".
Lyrics
When you're small every sink is a swimming pool,
When you're small a spare button's a plate,
When you're small everyone's gonna think you're cool,
Cause you're the only one who fits through a grate.
When you're small a kitchen sponge is a trampoline,
When you're small your dad's comb is a jail.
Oh, when you're small every TV's a movie screen,
And your goldfish is a great orange whale.
You can climb inside a paper airplane,
And fly yourself down the hall.
Every small lake's a lake! Every crumb is a cake,
And there's never any reason to crawl!
Baby when you're small.
Baby when you're small.
Notes
Baljeet isn't there during the microscope scene in the song and the scene when Phineas, Ferb, Isabella, Irving, and Buford are in the cup.
When Phineas, Ferb, Isabella, and Baljeet all get on the paper airplane if you look close enough when Phineas and Isabella are getting on Phineas is seen helping Isabella onto the plane.
Errors
The kids appear to change shrunken size throughout the song and episode itself; they can be the width of a sponge, about small enough to hold a needle, or even small enough to hold a ring. At the end, they are microscopic.
When the gang relaxes in the teacup they have swimsuits on, but they never shrunk with them.
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