If you are not sick, you can find an early education teacher to teach this kind of problem. If the teacher can't hold the pen after teaching for a month, in theory, IQ or writing center should be considered.

It is more appropriate for children to learn to hold pens when they are about 4 years old. It is also possible that the child is left-handed and can't hold the pen in his right hand. This needs to be guided slowly. You can buy a pen container to practice. You worry too much about whether his hands will deform when he grows up.