Have Daddy Donut reading time. You can do this at home or invite dads to come to the class to read with a few students as they share donuts. Ask them to point out pictures starting with the letter D as they read.
Give your child(ren) some dimes and let them count by 10's as high as they can. Support them and model counting by 10's as needed.
Read a book about Ducks to your child and have them quack three times each time they hear the word “Duck” in the story.
Make signs and have your child(ren) post them around the house or in the classroom on things that start with the letter D (door, doorknob, dirt, dust, Dad, dirty clothes hamper, dishes, etc).
Tell your child(ren) about friends or family members who have names that start with the letter D.