Do you ever plan to have another child? If so, what will you do when/if your daughter wants to go one way and the baby wants to crawl another? How will your newly-walking toddler keep up with your older child? What if the baby wants out of the car seat and the older child needs to go preschool?
Not to derail this thread but I personally chose not to leash my children but to stay home when I couldn't manage four toddlers in public, which I couldn't.
They make me uncomfortable, personally. I had no money for a double, triplet or quad stroller. So I stayed home a lot and enjoyed my children there.
No judgement, just my own experience and opinion.