What can I give my 6 month old to stop him from getting constipated? I've tried juices and fruits and nothing helps. His stool is really stiff and dry

Constipation. At 6 mos of age you should introduce solid foods, give a lot of fruits, Vegetables, juices even prune juice, water it down for him, not too much apple nor bananas, make sure his pediatrician is aware of this problem particularly if he had it since birth, he might need to do some tests to R/ O Hurshsprung disease. Good luck.