You need to be concerned about getting enough, and the right kinds, of fats. But all commercial formulas are well balanced. As long as your LO is still drinking 24oz of formula alongside the solids he will be fine. Depending on where you live when they suggest switching from formula to whole cow's milk, but when you start introducing cow's milk you can slowly decrease the amount of formula you give your son.
Thanks carpe vestri vita .
I live in USA and here they start cow milk after one year of age.
I am trying my level best to give him proper food .
Thanks