Runny poo

My 10month old is happy and healthy. He was intolerant to my breast milk and at 9 weeks switched to nutramigen which he loved and was a different baby over night. Started weaning at 6 months and added dairy slowly which he seemed ok with but his poos have always been on the runny side and quite smelly! Even from birth he’s never had a solid poo is this normal? He has a good balanced diet lots of fruit, veg, meat ect and home cooked meals. I don’t add salt or sugar.