I had an anterior placenta with most of my babies as well (in the front). With some I could feel them kick through the placenta (kinda depends on where in front it is located actually how much you can feel and where), with others it was more distinct on the sides and top. It just all depends!
As for when - I really don't remember. The thing I do remember is the first one was around 15 weeks - after that it was earlier and earlier. That's about it as for when.
at 2:13 PM on May. 27, 2009