I have di/di boys this is what we have for doctors appointments plus it grows with them & you and grab the car seats that click right in too!
Baby Trend Sit and Stand Double Stroller, Onyx https://www.amazon.com/dp/B01AZ20SSQ/ref=cm_sw_r_apan_i_75SKZ4R0JT936QMEZPJ0
I also got gifted this one we use for bigger outings or my walks at the lake. Perfect for the zoo, aquarium etc.
Baby Trend Navigator Double Jogger Stroller, Tropic https://www.amazon.com/dp/B01AZ20LDI/ref=cm_sw_r_apan_i_ASA4ZDZD78J4C5THX4YX
Carseat link: Baby Trend Secure Snap Tech 35 Infant Car Seat, Chambray , 16.5x16.25x28.5 Inch (Pack of 1) https://www.amazon.com/dp/B07K57ZZSS/ref=cm_sw_r_apan_i_0DAEK43T00983R3VF01A?psc=1