Generally, no, little boys do not have significantly more testosterone than little girls, except briefly after birth.
Here's a breakdown:
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Neonatal Period: Shortly after birth, baby boys experience a temporary surge in testosterone levels. This is a brief period where their testosterone levels are notably higher than those of baby girls.
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Childhood (Post-Neonatal to Puberty): After the neonatal period, testosterone levels in boys and girls are very similar and relatively low until the onset of puberty. The provided source states: "After birth and until puberty commences, circulating testosterone concentrations are essentially the same in boys and girls, other than briefly in the neonatal period of boys when higher levels prevail."
Therefore, the key takeaway is that while a difference exists immediately after birth, this difference largely disappears throughout childhood until puberty begins to change things.
