how to use manners at mealtime. explains manners.
age 3-5
source google books

this book is about a child learning manners
source: amazon.com
age range: 2-6

Now Baby and Daddy can cuddle and count along with this hug-and-read book perfect for Baby's teeny, tiny hands.
Source: Pierce County Library

Mealtime—“Yummy-in-the-tummy time”—is an opportunity to teach young children two major life skills: nutrition and table manners. Simple but important mealtime routines come to life as the toddlers in this book remember to wash their hands, use a napkin and fork or spoon, stay at the table, and eat healthy foods. Toddlers also learn the one big rule for mealtime: Always try one bite (“You just might like it!”). Parents and caregivers want toddlers to develop healthy eating habits and positive mealtime routines. This book helps them do so with Verdick’s keen ability to speak directly to little ones and Heinlen’s delightful, appealing illustrations.
Source: amazon