Do not be fooled by ultrasound rookie collectibles for players born before 1956. Ultrasound was first used in 1956, and thus there will never be ultrasounds of Babe Ruth or his fellow contemporaneous prenatal phenoms.
Brian (Eddie Murray and Paul Molitor, both born in 1956, would be the earliest Hall of Famers who could possibly have sonograms available. Therefore, if you come across a born in 1955 Robin Yount sonogram, you can be assured it is not authentic)
Brian
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