A retreat to nature

Giants once roamed the land and dominated other species, their hight could range from 150 to 230 ft tall, they where vicious and was at the top of the food chai, human however where lower. They were hunted down and used as food but over the years, the giants population declined till they where no more and that enabled the human species to thrive and develope.

Fast-forward 2000 years
Dan finds a baby in his yard, it was a big baby, how big, well 4ft tall baby barely a month old, this was clearly not an ordinary baby, he decided to train it rather than kill it like a normal human would do to prevent future threats like multiplication from the Young giantess.

Did he make a mistake?