2 month old baby boy, mix breast feed n formula, not passing motion for 48 hours. previously once daily with the same formula,normal stool,yellow,soft,straining a little but no crying. now passing gass, feeding n urinating normal. now weight 6.8kg, birth weight 4.16kg. previously I gave enema and lactulose and the stool was not even hard,and small amount. kindly advise tq