Both for me go back as far as I can remember, I did not know what a furry was until had internet access but furry for me is more spiritual with a lot of feeling that in the past I have lived as a few different animals and even as a dragon, but as a young child I used to pretend to be other animals, but not in an anthropomorphic form, I have had dreams as an anthro form but usually they are rare and as a fursona I am not an anthro scaly either it just never felt right for me. I don't know if it autism that makes me feel more animal then human or that I did live in the past as the animals I role play as now. That and I have no sexual interest in the fandom like so many other people do and that's why I say its spiritual for me. I discounted hanging around most furries when I discovered the sexual aspect of it. Not that I feel that it's wrong or right I just have no interest. I would identify with being asexual then anything else
I have always had a desire to be in diapers as well and was forced out of them and always envied kids that where allowed to wear them longer, I was 14 though when I guess I could say diapers became a fetish, when visiting my dad I had to go to bed at the same time as my younger brothers, something like 8pm, my mom got me watchman tv so I could sneak that with me on weekends at my dads house and took diapers from my brother so I could stay up later and watch that TV in bed and use the diapers so I would not tip off to my dad that I was still awake, so the DL thing came by accident,
Speaking of kittens, Mattew is largely responsible for my entry into the furry fandom. I had been ABDL long before that. It was the artwork (thank you Mattew) that really hooked me. The Furry fandom is a perfect imaginative fit for my Little side.
I've been into the diaper loving side for as long as I can remember, but considering myself as ab was a slow process. However, I became a furry in a completely unrelated way. I really enjoyed anthropomorphic characters in cartoons and comics, and have always gravitated to that. I can't remember what it was that made the connection between being a furry and an abdl, probably the art.