It's expected to climb and has already reached number one in the "Fiction about Value and Virtues for Children" subcategory on the website.
A positive review titled "Beautiful keepsake" read: "The poem throughout is lovely Don’t really understand the negative reviews, it’s a beautiful book and clearly meant more for a Father or parent to read and give them a smile. My children loved looking at the pictures and pointing out ‘daddy’, but it made my husband tear up".
Meghan Markle's children's book has jumped to the top five on Amazon bestsellers within hours as reviews pour in branding it everything from "beautiful keepsake" to "semi-literate vanity project".
"The Bench," which has an average rating of four stars online, was inspired by a poem the Duchess of Sussex wrote about Prince Harry's first Father's Day.
It promises to explore "the special relationship between father and son, as seen through a mother's eyes" and was released on Tuesday.
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The 40-page $18.42 (£12.99) book is illustrated with pictures of a family including one of Meghan cradling a newborn baby in a possible nod to their newborn daughter Lili.
Despite a bumpy start that saw it creep to just number 100 on the Amazon chart yesterday, it has now flown to number five on the UK Children's Books list.