At 6 weeks DD3 had chronic diarrhoea, the doc checked her out and said she was healthy but we could try her on a lactose free formula (she never tested her) she has been doing really well on the lf formula but recently she's been quite constipated and it was making her uncomfortable, we thought this might be a sign that she was ready to move back to the normal formula but after 24 hours on the normal formula the diarrhoea returned, we've gone back to the lf formula but I hate all this chopping and changing. Anyone have any advice on lactose intolerance or even how to deal with the constipation if it returns (she's 15 weeks now)