Listen to You Must Have Been a Beautiful Baby online. You Must Have Been a Beautiful Baby is an English language song and is sung by Bing Crosby. You Must Have Been a Beautiful Baby, from the album Crooners Vol. 4 Frank Sinatra, Nat King Cole, Dean Martin, Bing Crosby, Perry Como, was released in the year 2012. The duration of the song is 2:56. Download English songs online from JioSaavn.