Im starting to do alot of research as to whether ill need a double pram or not for my DD (who will be 18 months old) and newborn in November??... im just wondering for those with around this age gap did you need a double pram?? im looking at getting a baby jogger city select but i dont want to spend that much money if DD2 will only want to stay in the pram for another 6 months (so when she is around 2)

any advice would be great

Thanks