React 15.2.1

HTML

<script src="https://fb.me/react-with-addons-15.2.1.js"></script>
<script src="https://fb.me/react-dom-15.2.1.js"></script>
<div id="container"></div>

Babel + JSX

class MyComp extends React.Component{
	render(){
  	return <ChildComp name='SUren'/>
  }
}

class ChildComp extends React.Component{

	constructor(props){
        super(props);
  }
	render (){
  	console.log(this.props)
    return(
    		<div>
    		  <h2>{this.props.name}</h2>
          <h3>{this.props.age}</h3>
    		</div>
    )
  }
}

ChildComp.defaultProps = {age: 35};

ReactDOM.render(<MyComp />, document.getElementById('container'))