Vitamin D
Vitamin E
Vitamin K
Water soluble vitamins are not stored and so need to be replenished daily. There is less worry about over consuming water soluble vitamins because the body will eliminate any excess as waste. For example, an excess of vitamin C is eliminated through the urine.
It is unlikely that you will be over-compensating for your child's needs through a single multivitamin. However, always store vitamins and supplements out of reach and in childproof containers.