When I get queries saying a book is 9 pages, I wonder if that means book pages or manuscript pages. And if you mean manuscript pages, do you mean it’s 9 pages of 12 point font, double spaced? Or do you mean you’ve set it in 36 point, with one sentence per page because that’s how picture books look?
This is why agents and editors prefer word count as a guideline in queries. Because then if you tell me your picture book is 3,700 words, I don’t have to think too hard before I understand that it’s way too long.