This is my first Anterior Placenta and let me tell you I just started feeling his kick up front and I'm 30 weeks. this worried the heck out of me too, but as soon as the ultrasound tech said that the placenta was up front and that there is about 6 cm of placenta and other body parts cushioning his kicks, it all made sense to me. But really, she should have told me at my first ultrasound, given my history, we lost our first baby at 39 weeks for unknown reasons and the first sign was no movement.
So naturally i was freaked during the mid twenty weeks with this pregnancy, I thought I should for sure be feeling kicks by now. Anyhow, I didn't get confirmation until week 29 that I had a Anterior Placenta. I am now feeling him kick, but still not as strong as my first baby, she was very active and I could feel her kicks by week 19. It was strange to, during my ultrasound with this baby, I could see him move on the screen, but I still couldn't feel it.
So dont' worry, as soon as the baby gets stronger he will be kicking up a storm.