Baby's First Morning / What Is A Baby / La La Lu Lyrics

What is a baby? I just can’t understand.
It must be something wonderful, it must be something grand,
‘Cause everybody’s smiling in a kind and wistful way,
And they haven’t even noticed that I’m around today.
What is a baby anyway?
Oh what is a baby?
I must find out today
What makes Jim Dear and Darling, act, this, way