Anonymous wrote:OMG it's OK
Sometimes it is just regression esp if he's got a lot of new stuff happening in his life, new lessons as well.
But you also may want to understand working memory. Some people have more than others. My son for example really struggles with retaining info. An example of working memory is sightreading music. So a kid who can remember and build on memory will play the song after practicing a few times. If you have poor working memory it will be very hard to keep it all in balance because you may forget parts as you continue to learn it. So ADHD kids will have often poor working memory as it goes along with executive function to some degree.
Don't jump to the conclusion that your kid has ADHD but learn about working memory and see if there's any pattern to other things he's struggling and forgetting. My guess is it's likely just a phase at age 8. FWIW my kid who I told you about was diagnosed with poor working memory at about age 9/10.