Hi there, they do say breast fed babies don't get constipated, I don't know if this is totally true, but my first and second son, both breastfed and went a really long time between poops, talking like 10 days sometimes. It was horrible, it definately was uncomfortable for them, but I have been told that as long as it is soft, it isn't actually constipation.

Both my boys had cows milk intolerence, so maybe try cut out excessive dairy and see if that helps.

Also the bad smell may be the reflux, the losec can take at least 2 weeks to work properly, hopefully the smell decreases then.