There is no fixed age when children should be out of a High Chair and transition to a Booster Seat. On average, this happens between 16 months and 2 years of age. Your child will indicate when it is ready to make the transition. It's important that the child doesn't exceed the High Chair weight limit…
When a High Chair is no longer an option and your child is not ready yet for an adult chair, it is best to have a look for some alternatives. Nowadays you can find Booster Seats that offer the same amount of support and safety as a High Chair.
Other safety considerations include:
- Check that the seat is assembled correctly and complies with standards by theConsumer Product Safety Commission. There’s also the ASTM, and the Juvenile Product Manufacturers Association’s standards. 
- Ensure that your dining table is heavy for a hook on the booster seat, sufficient not to tip over when supporting your child’s weight. 
- Avoid attaching the booster seat in a way your child’s feet touch the dining tables supports. Otherwise, they’ll push against these to dislodge their support seating. 
- Double-check or test that your booster seat locked securely onto the dining chair or table. Thats before putting your child on the booster seat. 
- Use the safety straps. That includes the middle strap between your child’s legs if your seat has a three-point harness. That’s to prevent slip-outs and falls. 
- The dining chair to which you’ll attach a booster seat must be sturdy, heavy, and stable with a backrest. Avoid using a bar stool or folding chair. 
- Never leave your child strapped in the booster seat. When unstrapped, don’t allow them to stand or kneel on it to avoid tipping over. 

 
             
                 
                 
                 
                