These small things are of great importance in your kid's life and when you will reward them for the hard work then they will do more efforts to make the assignment perfect.Mistakes are the part of sewer’s life and of course when you will sew some project then you can change or amend something because of a mistake. Never be too harsh on yourself at the time of accepting the mistake or when you are making someone learn this profession. Mistakes can help you in moving forward and for the next time, you will try your best to avoid them.See here: