Anyone give their kids probiotics? My daughter has had chronic constipation since age one and takes…

Anyone give their kids probiotics? My daughter has had chronic constipation since age one and takes Mirilax everyday. Recently she’s been having tummy troubles more often.... I’m taking a good look at her diet (she eats really good to begin with) but also looking into probiotics but know nothing about them. Waiting on a call from her Dr...