I can't remember my earliest childhood memory (idiot) but Firehorse's earliest memory struck a chord with me, and as he has tagged me, here it is. It is interesting in so far as that it is similar but my memory is much more vague in detail.
Sick at home. Age three. Pyjamas and dressing gown all day. Continues for some days. Doctor diagnoses tonsillitis. Small local hospital. Tonsils removed. Chipped enamel bed. Very sore throat. Hunger and thirst. Jelly and ice cream was like the nectar of the gods.