Now We Are Six is a 1927 book of children's poetry by A. A. Milne, with illustrations by E. H. Shepard. It is the second collection of children's poems following Milne's When We Were Very Young, which was first published in 1924. The collection contains thirty-five verses, including eleven poems that feature Winnie-the-Pooh illustrations.

https://en.wikipedia.org/wiki/Now_We_Are_Six

When We Were Very Young

When We Were Very Young is a best-selling book of poetry by A. A. Milne.[1] It was first published in 1924, and it was illustrated by E. H. Shepard. Several of the verses were set to music by Harold Fraser-Simson. The book begins with an introduction entitled "Just Before We Begin", which, in part, tells readers to imagine for themselves who the narrator is, and that it might be Christopher Robin. The 38th poem in the book, "Teddy Bear", that originally appeared in Punch magazine in February 1924, was the first appearance of the famous character Winnie-the-Pooh, first named "Mr. Edward Bear" by Christopher Robin Milne.[2] In one of the illustrations of "Teddy Bear", Winnie-the-Pooh is shown wearing a shirt which was later coloured red when reproduced on a recording produced by Stephen Slesinger. This has become his standard appearance in the Disney adaptations. On 1 January 2020, When We Were Very Young entered the public domain in the United States,[3][4] but remains protected in other countries[clarification needed], including the UK.[citation needed]
Book by A. A. Milne

https://en.wikipedia.org/wiki/When_We_Were_Very_Young

When We Were Very Young, Return to the Hundred Acre Wood and The Best Bear in All The World.

And I was right. There are only two books of verse, and two books of poems.