Beautiful Boy (Darling Boy): John Lennon
Released in the fateful year of 1980, Beautiful Boy is John's love song for his then four year old son, Sean. It begins with John apparently comforting Sean following a nightmare, but develops into a lovely tribute to the joy that Sean had brought into his life.
Some interesting facts: The line, "Every day, in every way, it's getting better and better" is attributed to French Psychologist Émile Coué who used this line as a mantra for his patients.
Also, it is in this song that you'll find Lennon's famous line, "Life is what happens while you're busy making other plans".
I know that a four-year-old is not really a baby, but it's Saturday afternoon so I'm hoping I can slip this one in.
... Oh, and I have an idea about Celine Dion's cover of this song. Let's not speak of it!