Make letters a regular sight when teaching the alphabet. Keep flash cards handy, cut out letter shapes and hang them on the wall, put up refrigerator magnets or give your child an alphabet puzzle. Spend at least a few minutes a day playing with the letters while saying their name, or stop periodically several times per day to point to a letter. Introduce one new letter at a time, and every few days go over the letters she already has learned to reinforce the recall. Play matching games by matching upper case to lower case letters, or by matching a letter to an image that starts with the same sound it makes.
Using music to aid memory can give your child an outlet for his energy while he is learning. Sing the alphabet song, or songs that call out letters, such as "BINGO was His Name-O". Alternately, sing songs that feature words that start with specific letters, such as when you are learning the letter 'C' you can sing the song, "'C' is for Cookie." Hang a letter cut-out or write a letter on your dry erase board as you sing the song.
While driving in the car, sing a song about something and pause to ask your child what letter sounds the words start with. For example, if singing "The Farmer in the Dell," stop after you first introduce the farmer character and ask, "What letter does 'farmer' start with?" Help your child if he is unsure. When you get to the wife, stop and ask what letter wife begins with, and so on with the rest of the characters in the song.
Apart from sight and sound, throw another sense into your activities to help your children improve recall: the sense of touch. Give your child large wood or plastic letters to hold and manipulate in her hands. Have her trace letters on paper with her finger or with a crayon. Play in a sandbox and trace letters into the sand, or let her copy letters onto a chalk board or dry erase board.
Making an alphabet book is not only a fun activity, but also a keepsake to treasure. You can print out alphabet worksheets and put them together in a binder, make an alphabet scrapbook or get a notebook and write a different letter on each page. Have your child find items that start with each letter and glue them into the appropriate page to make a collage. Every time you go through the book with him, say the letter's name and say the names of the images that begin with it, putting stress on the sound.