I never had one, because I only have 1 kid- the only issue I see with it is:

Your 3 year old will be up front, and new born in the back– if you must do a “pop-a-wheely” to get up a curb, it would be front heavy– and you might struggle

other then that, I’d say go for it! (if you can afford it!)

also available: side-by-side [watch out for doorways]

and, more expensive:

good luck~!