DD is 8 weeks and has been exclusively FF for the last 3-4 weeks. She has been having digestive problems: being sick after feeds, days of not pooing ending in explosive diarrhoea and was screaming in pain, kicking legs up to stomach, etc. during and after feeds. She was permanently hungry because she would feeds for a couple of ozs then the pain would begin and she would be unable to continue but would still be hungry and feeds would stop/start like this over a couple of hours. I saw a dr. who was concerned that she might have an intestinal blockage but this now seems unlikely. I bought some colief drops on the off chance they might work and they made a huge difference overnight. She is now feeding normally and is a bit colicky but only what would normally be expected for an 8 week old baby. The dr. thinks it may well be lactose intolerance but because this is often temporary is unsure whether to refer her for testing, etc. because the problem may correct itself. Colief is great but a real faff to prepare: each feed has to be prepared half an hour before it can be eaten and as I have been feeding her on demand this leads to a long delay and lots of crying between the time she gets hungry and 'asks' for food and the time she is fed. I'm wondering whether to switch to SMA LF to bypass this. Is there likely to be any problems if I switch formula and does anyone have any experience of Colief/SMA LF?