Our pead also thought ds may have had while we were still in hospital but he wanted to wait and see. So he was officially diagnosed at 4 weeks, it was grand final weekend and we stayed home all weekend. Turns out the movement of the car helped settle the reflux. That was one hell of a weekend you could see ds was in so much pain the screaming was awful. He ended up on Zantac straight away. He only needs it now when he is teething as it flares right up again.