My 3yr old daughter suffers frm constipation now & again last episode lasted about 3m was giving lactolose & senna prescribed by doc dd's now been passing normally now 4 about 2m but her stools are white/pale yellow . I have noticed her twin sister also has light coloured poo does anyone know what it means?are they lacking in some thing i try to give them a healthy diet but are not great eaters.