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Pain is not verbally indescribable, I describe it to my doctor regularly (granted not seemingly all that well).  But a developing child has to learn that pain is pain, and then has to learn to name it. I say that one can have pain without being aware of experiencing it.  A person in a coma with a severe injury could be in pain without being conscious.  A baby could react severely to pain and not be aware of what pain is.  They react as they were built to react to pain, but conscious awareness behaviors are too rudimentary at this point (in infancy or very early development) to be cognizant of experiencing much.