A good, organic diet, with mostly raw foods.  Use Krill Oil for the child's better health, heart, and memory.   If you can't get or afford lots of organic foods, make sure a good, organic whole-food liquid vitamin dose each day.  Peter Gilliam has a bottle that I got somewhere online for about $16 for a month supply.

 Fish is a good source, but due to mercury poisoning in wild, and PCB poisoning in farmed, the clean Krill oil, or tested and clean Cod Liver oil gels should cover that.

 Sugar is an inflammatory and will distract.  So, away from sugar.