I have a 5and half month old baby who is 1 month pre term.. 2 weeks from now the colour of his stool is greenish yellow . first weeks he use to poo daily 5-6 times... but from last 2 days it has reduced to 2-3 times. we had travelled to Coimbatore 2 weeks before... it's very hot there. But his behaviour is normal.. he is active as earlier and doesn't seem to be tired. is it normal to have greenish yellow stool in babies?