Hi Fenella, my lo was diagnosed at 5 weeks, infant gaviscon was prescribed and took about a week to kick in. Unfortunately it didn't last (gp said it was the worst case he'd seen) and he was prescribed infant paracetamol and Carobel powder (to thicken his feeds). At 5mo he now only needs a quarter of the Carobel dosage in his bottles and doesn;t need the paracetamol at all - light at the end of the tunnel!
Sending you big hugs!