I would start this as soon as baby is old enough to hold on to these letters. Activities are hard with babies because you don't see results as quickly as you do with toddlers, but I promise the day does come when you see the fruit of your labors. This would be appropriate for as long as your child is in diapers, and perhaps at times even beyond that.
- Sassy Counting and Spell Bath Appliques (or any letter that is safe for your baby to hold and suck on--you know she will suck)
I am going to assume you are doing this at the changing table, but you can do it anywhere.
- Choose a letter to store at the changing table/station. Choose a letter your baby can possibly say. For example, most baby start babbling consonants such as "d", "m", and "n"--not "q", "v", or "t". Choose a letter appropriate for your child.
- Place baby on changing table.
- Hold up the letter. Let's say you are doing B. Hold the letter so baby can see it and say, "This is a B. The B says "Buh." One of my favorite letter movies--okay, my absolute favorite--LeapFrog: Letter Factory has a catchy tune for what each letter says, "The B says, "buh" the B says, "buh." Every letter makes a sound. The B says, "buh." I sing this song.
- Then give the letter to your child.
- As you are changing the diaper, say "Buh-buh-buh" over and over as your child shows interest.
- Change the letter as desired, but don't think you need to do it often. You can stay on the same letter for as long as your baby shows interest in it.
As your baby grows into a pre-toddler, you can add things like what the letter stands for. "This is a B. The be says 'buh.' Be is for Bear, and Ball, and Brayden."
As your pre-toddler starts to talk more, you can ask her to repeat a word B is for.
As your pre-toddler moves to toddler age, you can give her a few words and ask her which on starts with B. You can also ask her to think of a word that starts with B.
This is a simple activity that can both make diaper changes a little easier for you and teach your child about the letters of the alphabet!