I have definite memories from the age of about three. Really nice ones about not much in particular, such as going to kindergarten and the teacher taking us out to a huge field full of flowers on sunny days. And going back to that field years later and it being quite small in reality!
Something traumatic, engineered by a member of my family as a 'joke' happened when I was two - and the person in question took photos of me terrified out of my wits

When I look at the pictures I can feel the rush of fear, but perhaps that's driven by having the pictures as evidence. I don't know. I really don't know what was going through their head when they were taking those photos.