I believe in one of his books he said he was 8 pounds two ounce thus full term...according to a natality report I read most full terms are between 38 and 39 weeks with blacks being on the 39 week side. Where he got that info I don’t know I don’t see weight on the nordyke twins BC, maybe confidential or hospital records? I do know records are kept of birth weight.
Maybe Mom told him what he weighed...
My son weighed 8lb 12 ozs and was 19 1/2 inches long and I told him so...