If a baby from the past were raised in modern times, what would the most noticeable differences be between it and other humans born in modern time?

by hjf11393
NAmember81

I asked a similar question and got a lot of good answers.

Georgy_K_Zhukov

/r/Historicalwhatif has been replaced with /r/HistoryWhatIf. Also, /r/Askanthropology might be of use to you.