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