It has to do with water temprature

So use bottle warmer and tommee tippee bottles.Tommee tippee has heat sensor inside. When temprature is high enough the sensor turns purple and milk powder dissolves.I have found out that temprature is really the key here. With some patience and a good shaking the formula dissolves well. It reduces colic. My baby used to crying a lot at night due to the problem of undigested formula. Now she sleeps very well. Any kind of formula will do with this method. It has nothing to do with picking brand. Way to go mommy!