The stories were published under a seven-book contract with Australian publisher Serenity Press.
The new collection was announced in February, which includes five picture books and two young chapter books.
Sarah, also known as Fergie, has written over 25 books, including Budgie the Little Helicopter and the Little Red series.
In April, the 60-year-old launched a ‘Story Time with Fergie and Friends’ YouTube channel to help entertain children during the height of the coronavirus lockdown.
The episodes are released daily at 4 p.m. and the Duchess continues to upload episodes to the channel.
Several guests were also featured on the channel, with her eldest daughter, Princess Beatrice, appearing in June to read Rachel Bright’s The Worrysaurus.
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Beatrice’s guests included her parents Prince Andrew and Sarah Ferguson, Princess Eugenie’s younger sister and her husband Jack Brooksbank, as well as her grandparents – the Queen and Prince Philip.
Edo’s family, including Count Alessandro Mapelli Mozzi, came from France for the celebrations, and his sister Natalia attended with her two children.
His four-year-old son Wolfie was also there, acting as a page boy and a witness.
Beatrice wore a stunning vintage dress for the ceremony, which was loaned to her by the Queen.
The dress was a vintage Peau De Soie taffeta dress, in ivory tones by Norman Hartnell, trimmed in duchess satin and encrusted with rhinestones.
It was remodeled and outfitted by Queen Angela Kelly’s main dresser and designer Stewart Parvin, according to Buckingham Palace.
Beatrice accessorized the dress with a diamond-fringed tiara, which the monarch wore on her own wedding day in 1947.