my dd 6.5 mo is severely constipated. it has started since the day i've started weaning, i changed her formula to follow on milk too. i dont know if these may be the causefor her constipation she really screams her head off when she opens her bowels which she does every 2-3 hours in a day & its rock hard like marbles. its really causing my lo great discomfort. my gp has prescribed her lactulose which she's been taking for last week but it doesnt seem to work. cud anybody help me with any opinions.