Pannier rack bag for a not suitable suspension fork (Btwin Rockrider 5.1) I ride a Btwin Rockrider 5.1 with a baby seat, and want to attach one or two pannier rack bags. I guess I only can put it on the front wheel because of the baby seat which goes over the rear wheel, fixed to my seat tube.
At the store they say I have nothing to do, since this fork is not ready for that kind of accesories (it only has two screw holes for an eventual disk brake).

Is there any kind of rack I can use?

Do I have any chance to put it on the rear wheel under the baby seat?
While I am not familiar with your bike or its front fork. I would think a front pannier rack like this may work. http://www.zefal.com/en/racks/118-raider-front.html 

Please note that weight on the front fork makes the bike even easier to fall over. Please be very careful when the baby is on the back. I am not a fan of rear baby seats and would just buy a trailer.