Anyone's baby have "shark teeth"?

eyenigh

A few weeks ago, I noticed that my son had a little nub behind one of his front incisors, which I thought could possibly be a piece of that tooth. Fast forward to a few weeks later and it is most definitely not part of the first tooth, but a completely new tooth that grew in behind the first. 

I plan to bring this up with my pediatrician when we go for his 12 month checkup to see if we need to see a pediatric dentist but was just curious if anyone else had experienced this with baby teeth? If it was in an older child, did the adult tooth come in the same way? Teething has been so miserable for my poor kid, I dread anything that is going to cause any more tooth pain, even if it will be in the future.