I start by mentioning the results from my first son. We started with frizolac 1 and until 6 months everything was fine with digestion and bowel movements. After 6 months, we switched to frisomel 2 but had issues with bowel movements. We changed it and switched to frisomel 2 comfort, where we saw immediate improvement in the baby's bowel movements and never changed it since then. Today, with our second son, we started with frizolac 1 and noticed constipation in a few days. We changed it and switched to frisomel 1 comfort, where initially there were normal bowel movements but after a few days, the same constipation issues occurred. The pediatrician told us that the high protein content in the milk causes constipation, so he recommended frisolac HA, which is for protein allergy. We tried it for 8 days with no results and ended up with this specific milk today. At 11 o'clock, we fed him and within half an hour, the baby had emptied all the food from the past few days. As a result, we continued with the same milk without any issues in digestion and the baby's constipation. So, what I want to conclude with all of this is that every child is different and has different results with milk. For me, all brands are good. I hope I helped you somehow with the issue of constipation and milk powder selection