booster seat 
(also booster cushion)
noun
An extra seat or cushion placed on an existing seat for a small child to sit on.A booster seat helps the seat belt fit better for older children who are not big enough for the safety belt alone....
- Many parents incorrectly believe that their child is too old for a child seat or a booster seat.
- A belt-positioning booster seat will help position the seat belts on your child's body and will fit your child until she weights about 60-80 pounds.
- windowed
- window frame
- windowing
- window ledge
- windowless
- window of opportunity
- window of vulnerability
- windowpane
- windowpane flounder
- Window Rock
- Windows
- window seat
- window-shop
- window shopper
- window shopping
- windowsill
- Alforian
- alforja
- Alfred
- Alfredian
- Alfredian English
- Alfredo
- al fresco
- Alfrician
- al-Fujayrah