Some claim that in the song “All That She Wants” by Ace of Base “another baby” is synonymous with boyfriend (“Of course, baby means boyfriend”. *1).

Of course that is nonsense if you look at the lyrics to the song.

Look at:

She’s going to get you All that she wants is another baby
She’s gone tomorrow, boy.

How often is someone you would term of “boyfriend” “gone tomorrow”.

And look at:

“So if you are in sight and the day is right
She’s the hunter, you’re the fox
The gentle voice that talks to you
Won’t talk forever
It is a night for passion
But the morning means goodbye“

So a one night stand is a “boyfriend”? Since when?

The meaning is what it says: she wants a baby, perhaps in order to collect welfare benefits in Sweden – which were quite generous at the time.

*1 https://books.google.com/books?id=kOdwBgAAQBAJ&pg=PT32#v=onepage&q&f=false