Asking on behalf of my daughter who MAY be awarded care of two foster children this afternoon, the children are literally sat in their classroom waiting for the judge's final decision. We need to buy two car seats for a 4 and 7 year old, they are malnourished so tiny for their age. This is all very different from when I had my babies 30 plus years ago. What can you all please recommend. Could the 7 year old have a booster seat.