I think a sling is a great option for a while, DH and I bought DD a Smart Trike when she turned 11months at the recommendation of a friend. It starts as a stroller and as she has grown we have altered the tike to pull down peddles and it becomes a tricycle which is able to be controlled by us, in a couple of months we are hoping to remove the steering handles all together as she is getting quite confident with the peddles. For $180ish it has already lasted over 18 months, and we will be definitely keeping for baby 2! Good luck! Hope this helped.