Hi Debbie. My son got bad constipation on the gold formula when he started FF, switching to straight Karicare helped but I found that it still took a little while for him to have a regular motion without all the wind and pain(a week or so) so I agree with Janie to stick with one formula now he is off the gold. Also I'd throw out those coloxyl drops. The first time I used that it worked ok but the second time it caused all the wind and pain but no motion. Go to your chemist and ask for Duphalac which the paed recommended I use and it was the only thing that sorted the problem out for good. It might be sold under a different name but if you ask for Duphalac or just Lactulose which is what it is made from (sugar) and say it is for infant constipation they will know what you mean. It costs about $8 for a bottle. It works by lubricating the bowel which allows the stool to pass and it is much safer and gentle compared to coloxyl drops etc. The dosage is something like 7.5mls once a day reduced to 5ml, 2.5ml etc but which time he should be pooing like a trooper with no pain.