pragma solidity ^0.4.0;

    contract Child {
         uint X;

        function Child (uint a) {
            X = a;
        }

        function getChild() view public returns ( uint) {
            return (10);
        }    }

    contract Constructor {

        Child public d;

        event Mined (address childAdd);

        function createChild(uint a) public {
            Child d = new Child(a);
            Mined (address (d));
        }
     }

var childEvent = Constructor.Mined();

      childEvent.watch(function(error, result){
            if (!error) console.log('Child created');
            else console.error(error);
      });

var childEvent = Constructor.Mined({}, {fromBlock: 2000, toBlock:'latest'});

Constructor.Mined({}, { fromBlock: 0, toBlock: 'latest' }).get((error, eventResult) => {
        if (error)
            console.log(error);
        else
            console.log('Ok');
});