I'm probably not alone in this, but I thought it was "Ooh, baby, baby, it's a wide world." Didn't really give it a second thought until last year when I got the real song.
A childhood belief about misheard lyrics

others believed things like this
- That because Gerber Baby Food had a baby on it real babies were put in there. Thanks a lot cousin!— Nicole
- on "highway to hell" i always thought it goes "baby see, baby do" instead of "hey satan, payin´ my dues"— Miss Understood
- I only found out last year that a pony is not a baby horse.— Mescaline Frumblethond
- I used to believe that a baby shower was a tiny bathtub with a showerhead just for the baby.— Amy
- Until I was about 13 I thought chipmunks were baby squirrels.— Gina
- I thought that hippos were baby elephants— Gerna