I have a 5 week old baby girl, breast feeding, she is battling with tummy cramps and constipation, when we where at the pediatrician on 12 september 2019 and he said she is lactose and i must stop having dairy, i have but still no change,?

Some basics: Babies have relatively weak belly muscles & often use their fussing muscle (diaphragm) to help propel food along the digestive tract or to poop it out. Some are more fussy than others but this fades as they get older & stronger. Dairy can increase this for some but not all. Constipation is dry/thick poop, not just skipping days. If it is soft it is not constipation.