No major difference,just marketing gimmicks.
Breastmilk is best,but if forced to give top milk feeds,choose anyone,all ate more or less the same.
Changing brands won't make any difference.
Ensure correct ratio of water and formula powder.
If correct,a gharelu nuskha is,add 1 spoon plain
sugar in 100 ml of reconstituted formula,it works!!!
You can increase or decrease amount of sugar accordingly,if still hard,increase,if loose,decrease amount of sugar.
Do NOT,repeat,do NOT give any medicine.