Lauren Stern: Lower-case letters are more challenging than upper-case ones because of size variation and the frequent change of direction required.
Three and four-year-old children don't possess the motor skills to produce them. So I recommend waiting until your child is in kindergarten.
This double lines paper is ideal for teaching lower-case letters. It indicates three spaces, top space, middle space, and bottom space.
More than half of all lower-case letters fit within the middle space such as A, C, and E.
To help children understand the three spaces that lower-case letters occupy Handwriting Without Tears groups them as either tall letters starting in the top space, such as h, l and k; small letters, remaining within the middle space, such as a, e and m, and low letters, tipping below the bottom line such as p, g and y.