Babies digestion/Breastfeeding

So my 5week old breastfed baby has been crying and like trying really hard to poop for about a week now, I was under the impression it was what i was eating up until I changed my diet a few days ago and have seen no difference. Today i found out about dyschezia and it seems to be what’s happening, but i dont want to go back to eating those foods and that be the problem. Are there other obvious ways to tell the difference between dyschezia and a reaction to what im eating?