I used my Weeride from when DD1 was about 10m, but I really didn't get on with it. You have to ride with your knees sticking out sideways so they don't bang on the seat! And I have very stubby little legs so anyone with longer ones would really suffer!
I loved the look of this one and would have got one if I hadn't already got a rear-mounted one when I gave up on the disasterous WeeRide.
Will you be riding offroad where a trailer might be a better idea?
this one looks good and is from 9mo, but again, you might bang your knees on it.