All-in-One. 4-in-1. 3-in-1. Does it all. Last carseat you’ll ever need.
These promises sound exciting, don’t they? After all, you’ve probably shelled out over $100, maybe even close to $300 for a rear-facing only infant seat that only fit your child for about a year and now you have to buy another carseat already. Your kid keeps growing, wouldn’t it be nice to buy only one more carseat and be done with it all? Perhaps.
We need to get some basic terms out of the way since I’ll be addressing them frequently in this article. There are two types of carseats we’ll be discussing: convertible and combination. A convertible carseat is one that rear-faces or forward-faces, so it’s appropriate for newborns through preschoolers generally. A combination carseat is a forward-facing only carseat with a harness that can be removed to become a belt-positioning booster. Sometimes combo seats are called harnessed boosters. It’s all marketing, but the official class of seat is combination.
Let’s discuss what an all-in-one / 3-in-1 / 4-in-1 carseat is. These days it can be a convertible carseat or a combination carseat. An all-in-one carseat is one that “does it all.” This convertible carseat will go from infant to booster: rear-facing, forward-facing, and high-back booster. A 3-in-1 carseat does the same: rear-facing, forward-facing, and high-back booster. But a 3-in-1 carseat can also be a combination seat: forward-facing-only harness, high-back booster, and backless booster. Oh. That’s getting complicated. What about the 4-in-1 carseat? Well, that is a convertible carseat: rear-facing, forward-facing, high-back booster, AND backless booster.
What does one of these seats NOT do? It does NOT have a harness weight limit of 100 or 120 lbs. That’s a very common misconception. The carseat manufacturers are doing a much better job of labeling the boxes for their separate modes, but as you look at the pictures below, I think you’ll see why it’s easy to see why the harness might go to a super high weight limit. It doesn’t.
So we have the convertible vs. combination terminology out of the way and we know what an all-in-one vs. a 4-in-1 carseat is (er, basically the same thing, right?). Now let’s have some practice looking at these seats and their boxes so you know in the store *before* you buy if the carseat is appropriate for your 9 month old (of course, you could always consult our Recommended Carseats List and know which seats are appropriate right now and find one that will work for you!).
Questions to Ask Before You Shop
Does it have a rear-facing belt path? (Only if you are shopping for a rear-facing seat obviously.)
How long do I reasonably expect my child to use this seat?
Do I really want a carseat that I will be using for over 6 years? (Because really, what other piece of baby gear gets used for that long, let alone a safety device?)
The Evenflo Symphony LX is an all-in-one seat. It says so on the labels and on the box. Check out the label: 5-110 lbs. That’s misleading, because it makes you think the harness will take your child from 5-110 lbs., right? Wrong. It’s 5-40 lbs. rear-facing, 22-65 lbs. forward-facing, and 40-110 lbs. as a belt-positioning booster. There is a rear-facing belt path opening under where the child’s legs would sit, so you know it’s a convertible carseat. You could use this carseat from your child’s birth, provided he’s big enough.