Hello girls, I have another question. My daughter has been pooping eve…

Hello girls, I have another question. My daughter has been pooping every 3-4 days for three weeks now, once a day. She's behaving well and doesn't cry, just tenses up when she poops, turns red, almost cries, then smiles again. The pediatrician said to give her Linix, but it doesn't help at all. What should I do? Maybe see another pediatrician?