Well, my Mama had a baby
And that baby`s here to stay
Someday our baby maybe
Finally big enough to play
For now, I`m fetchin` diapers
For now, I`m helping out
I help feed him and I wipe him
When that food comes flying out
And it`s me who knows how
`Cause I`m the big one now
I hug him and I squeeze him
And I help him learn to talk
I try hard not to tease her
While she`s learning how to walk
I help to read him stories
I help pick up his toys
I teach her to play peek-a-boo
And I teach her to make noise
And it`s me who knows how
`Cause I`m the big one now
I love my little sister
The sharing and caring
I love to choose the teeny little
Clothes that she`ll be wearing
I love my little brother
There ain`t nothing to it
Well, sometimes it`s a dirty job
But someone`s got to do it
Well, my Mama brought a baby home
To join our family
And together every day we`re all
As happy as can be
That baby`s gotten bigger
That kid is really fun
And I`m so proud that I`m allowed
To be the grown-up one
It`s me who knows how
`Cause I`m the big one now
Yes, it`s me who knows how
`Cause I`m the big one now
Yeah, that`s me