Baby has been on Aptimal from birth, initially the readymade and now the powder (and some breastmilk at the start). She has always spat up quite a bit and been an infrequent pooper (every 2-4 days). Recently she has gone even longer without pooing to the point where she is quite unsettled and eating less so the doctor prescribed a laxative. Do you think it would help in this situation to change formula brand? I know they are all the same nuitritionally but have heard different brands can be better for different babies. Any experiences of this? On the other hand I don’t want to be randomly experimenting with her food.