Here are a couple i think are nice.
I'm really glad that you could come
And help surprise my mother
sit down, relax, enjoy yourselves
and chat with one another
Sorry I can't be with you
to join in Mummy's shower
But I'm very busy you see
I'm growing more each hour
Though I'm not there to thank you
for the lovely gifts you've brought
my family is grateful
we appreciate the thought
I'll be arriving shortly
and I'm as happy as can be
so, after I've been home awhile
please come and visit me
I'd like to say, though I'm not here yet
thank you for the gifts I'll get
And thank you from my parents, too
for all the gifts in pink and blue
My closet was empty, my belongings were few
but that's all changed now, thanks to you!
Good luck with everything.