Girls, hello. My youngest daughter has constipation, she poops a maxim…

Girls, hello. My youngest daughter has constipation, she poops a maximum of 2 times a day, only after massage, and her stool is frothy. We've been struggling for a week now, she cries before pooping, it's really bad. She used to poop 5-6 times a day without problems. What can we do? Maybe some specific foods cause this reaction? Those who think that not pooping for 5-6 days on breastfeeding is normal, please pass by. This isn't our case.