Yup. If you have a child ever other year (pretty reasonable) and have four kids, the oldest will still be in a booster when the fourth is born. We have two kid

Yup. If you have a child ever other year (pretty reasonable) and have four kids, the oldest will still be in a booster when the fourth is born. We have two kids (oldest is four and still in a booster) and we're considering a third, which is also making us seriously consider a larger car. We'll either need a larger car or a smaller car seat because we cannot currently fit three seats in our sedan (or at least, I don't think we can).