Quoting ☮ Phuket:" D3100... that is what i planned on getting. I just want to be able to take good shots of my kids and be able to zoom more than i can now.. i just have the lens it came it."
You'll need this lens since that camera body doesn't have an autofocus motor in it. For Nikons always look for the ones that say AF-S as opposed to AF.
And I dislike zoom lenses. haha. I use primes all the time (one focal length.) The primes usually have a wider aperture that gives you more depth of field. (bokeh, or the blurred background.)