Adele has been recording the rhymes and playing them back to her baby bump.
"She has been playing the rhymes to her belly. It's so Adele can get her voice as close as possible to the baby, so it can hear as many soothing sounds as possible," thesun.co.uk quoted a source as saying.
Adele, whose release 21 stands as the best-selling album of the year in the US, announced her pregnancy a week ago.
The Tottenham-born, Grammy award-winning singer recently revealed she hopes to have three boys by the time she is 30.
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