I remember lots of things before my 5th birthday:
I remember speaking at an early age where i lived before i moved to the place i had my 5th birthday.
I remember being hunted by wasps that flew into the appartment i lived in.
I remember me and my dad looking out the window, him learning me the names of cars.
I remember looking out the same window, watching some guy lay on the street, having been run over.
I remember sitting in a childrens chair, playing with a 3 colored toy. My mom said that "you couldnt have been more than 1 years old", how did you remember that.
+ lots of other things i remember.
But the earliest memory i have is a feeling. I remember something lodged in my throat, blocking air and feeling painful. My parents told me later that i ate a marble and was rushed to hospital, all blue in the face, saved at the last minute. Also 1 years old at this time.
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring" (Carl Sagan)