Lo hv diff to pass motion. Any remedies..she keep crying

Can feed lactulose. Get from pharmacy. It's safe even for infants. But do monitor her food, whether could it be because of new food, milk formula or may be a habit that she prefers not to pass out and keep holding it till it accumulates to a point that it's so hard to pass out. I went through a rather big ordeal with my elder son when he was around 2 to 3yo. He just hold his stools till a point that we had to administer the fleet treatment to get his stools out. After seeing numerous docs and specialist, all gave the same feedback that there was nothing wrong with his diet (except that he should up his fiber intake) and it is likely to be a psychological issue. After some time with us trying different ways to encourage him to pass motion daily, he became more at ease to do so and I guess as he grows, he outgrow the psychological barrier and now, he is a healthy boy who eats very well, with a daily consistent output too.