K.H.
Both my boys developed constipation when i changed formula on them. I read somewhere to mix in a little corn syrup in with their formula--i think about 1-2 tsp per bottle and it worked well, but I've only used it 2 times. Some advise not to use corn syrup because of the lack of pasteurization, but considering the discomfort they were in, i gave it to them anyway and they were both fine. Straight up prunes should work too. Good luck!