For english is not my mother tounge I can not offer too many, but you maybe like these I got from the wonderful booklet by Kari Pearson (the designer of cutest fabrics and quilt designs k.p.kids&co)
"Oh baby baby" :

Where did you come from baby dear?
out of the everywhere into the here....

and for a baby boy :

a dream has come true
all bundled in blue
oh what a joy!
our sweet baby boy!

for girls she has this one:

ten tiny fingers
ten tiny toes
our angel is here
in rosebuds and bows.

Maybe you want to replace the word "in rosebuds" with "on dinosaurs" or somewhat to make the poem more manly. ;-)
Greetings

Nice poems, Eva! I don't know any, but am sending this back to the top. hugs, M

I found these....could be cute with a little baby footprint design...

Little hands, little feet
Pure and precious, and Oh So Sweet!
__________________

A baby makes footprints in our hearts
that never dim or fade.
__________________

Babies baby makes footprints in our lives
Even before they arrive!
__________________

Where ere a baby's little footprints are found,
There is precious and hallowed ground.
__________________

The pitter patter of little baby feet
is music to the ears and ever so sweet!

The only one I ever heard was...
Snakes and snails
and puppy dog tails,
that's what little boys are made of.

My husband (the digitizer lol) says you could add the designs of some of those things to the verse.