One of the things that I've been trying to capture is my son talking at a young age. I really wanted to capture him saying things as only a toddler does, but I needed a way that was easy to process and organize. I chose to store it in an Evernote notebook called 'Children Voice Memos".
The ability to email items into your Evernote database is a powerful tool as most iOS apps support export via email. The first step is to actually thing record something in the Voice Memos app and then share via email.
You then want to enter your Evernote email address. If you enter @Your Notebook Name into the subject, it will automatically organize it. I would also recommend adding a description of what you are storing. Tap on send and you are done! Once you open Evernote, you will see your .m4a file properly organized and playable.