The best toy is one your child is going to play with, have fun with and learn from! That's one of the reasons I got into Discovery Toys!  How many toys do you have in your toy box that your baby, preschooler and school age child can all play with?  Not many, I bet!  Our toys are designed to grow with your children through developmental stages so that as they mature the toy changes with them.  Maybe it's our Measure Up Cups that babies like to put in their mouths and hit together, then toddlers stack, fill and dump and knock them over, then preschoolers mold playdough with them and learn simple mathematics while school agers are learning about volume and comparing sizes.  It's amazing what one small toy can do!  
Our family games cannot be beat for ALL ages!  They can all be adapted down or up to play with multiple ages!  Please check them out and ask me for suggestions!