Most children become confused with the lowercase 'b' and 'd' and also 'p' and 'q'. Why not make them tactile letters from either felt or sandpaper? (I used felt as cutting sandpaper is a nightmare). Cut your letters out and stick them to a piece of card 12.5cm x 7.5cm (3" x 5"). Let your children trace over the letters with their finger while saying the letter. Make sure to point out which side of the letter the bump is on. You can also make any other letters your children are struggling with.