Although the association between increased weight gain in this period and USTV ≥ 2.7 mL in boys did not reach statistical significance, possibly due to smaller sample size, we think it is biologically relevant due to the established relationship between testicular volume and circulating testosterone levels [ 32 , 39 ].
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Early Postnatal Growth and Pubertal Timing: An Ultrasound-Based Study of Breast and Testicular Development.
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