Darken or highlight lines.
If your child has trouble staying within the lines when making tall letters (like “T”) and letters with tails (like “y”), it may help to make the lines easier to see. Use three different colored markers or highlighters to trace the top, middle and bottom lines on lined paper. This can help your child remember that tall letters start at the red line (for instance), small letters stay between blue and yellow and letters with a tail dip below the yellow.
Download bold line paper, which can also be used to create textured paper.