Typically only infant seat can attach to stroller. He is old enough to sit in a stroller now. so look into a good convertible car seat that last the stages the longest. Also remember to max out the height or weight requirements.
Only bucket seats attach to strollers (like the one in your photo). You can switch to a convertible carseat but those stay in the car and you take your kid out and put him in a stroller. Thats the only way
Thanks everyone 😊💖💖
My won't connect to a stroller but I have a Graco 4 in 1 which will last forever (basically) cuz it has rear facing, forward facing, high back booster, and backless booster