My newborn twins are suffering with their tummy not going out foe about 2 days at a time. it was when they started the nan optipro ha powder formula from the premix. what do i need to do to help them. they are constantly farting and very uncomfortabl?

??????????: Not sure what you are describing. Newborns are expected to poop by 24 hrs of age & then variably as needed. They digest & poop using their breathing muscle to push food along. Tensing the breathing muscle hardens the belly & they often make noises in the process. Give them time to establish a pattern or have them seen. It all depends on how much they spook you.