used for my daughter when she was able to stand well seated (9 months) and I loved this solution the baby seat in front for a very young child! it is large and heavy for his age (20 months) and we will soon have to go to regret rear seat (max 15 kilos)
one downside: the bar "security" which often comes off its hinges ... but it is the belt that actually ensures the actual security function (the bar is a little gadget)