Yes, that's exactly what I mean - by using a car seat as a booster seat without the 5-point harness. Why? Because DD (3.5yo) is already at the tallest fitting on the 5 point harness. Yes, she will slow down in growth, but she'll still surely outgrow the 5 point harness, and then won't be able to use the seat belt because the seat belt itself is holding the booster seat in. Further, the middle seat only has a lap belt. Oh well. I grew up with only a lap belt!

