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This can be taught before the child learns to read or write, such as when they are drawing with you. Start by holding the crayon yourself as an example. Then place the crayon in your child's hand and wrap their fingers around it correctly. Guide their hand to trace a shape or write their name. Show your autistic child how to do this as early as possible; most children are able to properly hold a crayon by age 4. Have the child squeeze objects (such as a stress ball or play-dough) to build finger strength. Start with very soft objects and gradually work your way up to harder ones as the child gets stronger.  Play-Doh and clay can help with dexterity. Your child can also try tasks like watering plants with a spray bottle. Get art materials such as chalk, paints, markers, crayons, scissors, coloring books, and stamps. Allow the child to make art with the supplies, without any pressure to perform. For example, have the child thread beads onto a string to increase finger dexterity. This can be a good opportunity to spend relaxed quality time with the child. Let the child choose what they want to do, and do activities together. Working on vertical surfaces helps autistic children develop crucial wrist muscles need for writing. Use an easel to encourage the child to paint or draw vertically. Magnetic and chalk wallpaper are also great for this. This can help them learn about the letters. Let them play games related to the alphabet, and learn what sounds each letter makes.   Foam puzzles where pieces are shaped like letters Alphabet fridge magnets or window clings Singing the alphabet song

Summary:
Teach the child how to hold a crayon the correct way. Try squeeze exercises to help them build muscle. Improve the child's fine motor skills with art projects. Build strength by having them paint and draw on vertical surfaces. Expose the child to the alphabet with simple techniques.