DS was 3 weeks early. He had them descended at birth, but they were later found to be retractile. He also had a hernia. He had an operation at 18 months to bring them down and fix the hernia. One was found to have suffered damage and be smaller and so he's at risk of fertility problems and cancer also.
I have so much guilt over it not having been discovered earlier and fixed earlier, even though he had seen a paed regularly from birth and she had not expressed any concern.