Ask friends around you with kids who cycle. They will give firsthand experience of the brands to buy and the tricky things to check for. This way you will save time and make a right choice. You will also get valuable information about the price comparisons and the life of the bikes. They can also help you with choosing one of the local stores. However, you should do a thorough market research before going for one option.
If your child has friends who already own bikes, ask them to let them have a ride. Check which bike the child is comfortable with and note down its model number, and try to get the details of the store they got it from.
Take your child with you:
When going to buy the bike, take your child with you. Make him try bikes at the store. The child should be comfortable with the three most important parts; seat, handle and breaks. Most children are also very particular about the color of their bikes so you should let them choose. You can ask the shopkeeper if he could let the child have a practice ride so that he can judge it well. Choose a bike that is good value for money and will serve its life well without incurring too much maintenance cost.