A question about my (nearly) 5-year-old's remarkable memory

Story time - something quite wild and, I'll admit, a bit unsettling, happened earlier this week. I just wanted to share and see if anyone else has experienced something similar with their kids.First, a quick bit of background: My son is turning 5 in June. He's been slow to develop socially, while his literacy and numeracy is astounding. Already reading, can count into the hundreds, etc. Half a year ago, some of his behaviour led us to think he could be on the ASD spectrum, which we've investigated. Nothing conclusive yet, but we've secured some support for him to make the transition into 'big kid school' easier this coming August. (We're in the UK.) Also, it's worth noting that since our initial concerns, he's started to blossom socially - while he's still a shy little kid, he's come along a huge amount in six months.Anyway - this past Sunday, my son was given the gift of a new Lego kit. For the purposes of the story, it's important to note that this is a complex enough build that the build instructions are separated into about 95 separate steps over two booklets.Since receiving it Sunday, he's obsessed over it - taking it apart and rebuilding it daily. This past Wednesday - by which point he's probably built the truck at most 4 or 5 times - he's working away on it while I watch. I pick up one of the unique pieces in the set and ask him if we get to put this piece on the kit as part of the first instruction booklet or the second.He replies that it's in the second booklet. And then he tells me the exact step (out of ~95). I check, and he's exactly right. I test him again with five more of the unique pieces. Each time, he tells me the exact build step without any hesitation.It was remarkable. He's done this in the past to a lesser extent - e.g. able to tell us the page numbers that different stories begin on in his story anthologies - but this seems like a whole other level.He seems to have extraordinary recall. I just thought I'd share the story to see if other parents have witnessed similar behaviour in their kids in the past. via /r/Parenting http://ift.tt/2pRHP1S