Tips on Providing Your Child with the Best Sitting Position for Handwriting
If the table height is too high for your child try using a booster seat or cushions to raise them up so that their bent elbow is about 5 cm above the table
If the table height is too low you could use blocks or bricks to raise the table to a more suitable height.
If a chair is too high for your child try using a plastic box or step for them to rest their feet on.
If the chair is too deep for your child when they sit right back in it, try propping cushions up behind them, some children may not find this comfortable so just do the best you can with the furniture you have.
The main aim is to be able to push the chair under the table so that when your child is sitting correctly, they are close to the table but not touching it with their tummy. Their elbows should rest comfortably on the table while leaning slightly forward to form a triangle position which encourages your child to use the supporting hand (non-writing hand) to move the paper up the table when writing.
In school sit a left handed child on the left of a right handed child so they can both write freely without knocking into each other.