I am trying to find the title, and hopefully where I can purchase, a
paperback book that my son learned his first words.  It was basically
a book about animals and balls.  The book was read in 1991-1992. 
However, I believe we bought it at a garage sale so it was not new. 
There was a lion and a giraffe
for sure and probably more animals.  The beginning of the book started along
the lines of big ball, small ball, green ball, red ball, etc.  In the
end the animals were in a hot air balloon trying to get the ball that
went over a great wall type of structure.  When they got in the air
the found thousands of balls on the other side of the wall.