my dad swears by LSA - you can get it from health food stores and some supermarkets. It's just ground up almonds, sunflowers and another seed but can't think what. You just sprinkle about a tablespoon over your cereal. I like to add it to smoothies.

My DD has had probs with constipation and I find giving her a dried fig a day really helps. You can also soak (dried) figs in water for a bit and they are more mushy, therefore allowing your system to break it down faster aiding digestion.