So my DD will be 5 this May and I want to start booster training her in the summer. She is about 43 inches tall and 33 pounds. She will be going to kindergarten in the fall and will be driven in the morning. I think it will be easier if she is in a booster for the drop off. We have an old style Monterey and parkway sgl that DS is using backless currently. I don't mind buying another seat but I would prefer one that is latchable. She is currently riding in a Frontier85 and a Nautilus.