MOMS!! I need advice pleaseeeee, I have no idea who to ask about this.

So I’ve posted about my chunky son before, not fitting clothes.. and now he’s outgrown his car seat. The car seat we have been using is 5-22 pounds and he is now 25 pounds and his shoulders obviously don’t fit anymore. So me and my SO went shopping for a new one. There’s plenty of options until we realize... all the ones we were looking at have NO HANDLES!! I mean like, no way to carry the seat at all. Which is fine, but my son is only 5 months old.. and I don’t feel comfortable carrying him to and from the car yet since there is 2 sets of stairs I have to walk down to get to my car from my apartment. I went to 2 different stores and I couldn’t find a big enough car seat that has a handle. Am I missing something here? Should I just get one without a handle? Please help me out!