You can request a death record from the county, that will give you the place of burial. Then you can call that cemetery and get the plot location.
good luck in your quest for the truth on this. first, this is 1968 your inquiring about remains of a baby. unless you go to the cemetary itself & do your own research, only then will you unearth hidden truths. the question is: how important is it to you
Thanks! Your answer is awaiting moderation.