Hi - I hope someone can advise me. My ds has been on formula for about 2 weeks (he's 6 weeks old). Just recently he's started screaming his little head off after his 10.30am and his 2.30pm feed. He turns purple and is pushing but with little results. I was using Aptamil but have changed to SMA for a couple of days to see if it helps (doesn't seem to have). Does anyone know if there is a huge difference between formulas and whether they can be giving him an upset stomach? On a slightly different note, his tongue is very white and furry - normal?