I watch a 4 1/2 yo twice a week. Today, I sat her in my dd's Regent (dd was in K) when I picked her up. She said, "This booster seat is so soft. It's not like my booster seat. In mine, the seatbelt does not connect to the booster seat like this one." She'll be 5 in Feb, and probably between 40-45 lbs. She's pretty light. Her mom actually buckled her in today when I picked her up, so I'm hoping that she's getting some ideas.