There’s not too much you can do! It is the nature of stringed acoustic instruments to go out of tune sometimes fairly quickly. The weather and barometric pressure are a factor in this! We suggest patience with some products! One of our offerings comes with a pitch pipe to help in tuning, and there are also many downloadable apps that can help with this. Besides, what also comes along with ownership of an instrument is maintenance and responsibility–it can be a valuable lesson in discipline for your child to learn and get into the habit of tuning his or her instrument when needed.