How creationism explains babies with tails

I haven't looked into the genetic reason for human tail mutations yet, but I have a quick comment.My son was born with 7 toes on each foot.What aspect of his evolutionary past was creeping up?He had also had an extra bone growth coming from just above his wrist.Did our ape ancestors have extra digits too?I think you can read into genetic mutations what you want, but its not really proof of anything.