ive never had this problem when mixing the gaviscon through her usual cow and gate formula but she wouldn’t drink her new formula sma althera so dr suggested mixing the infant gaviscon through it to help her accept it and she does want to drink it now with the gaviscon but it blocks the teat doesn’t matter what teat I put on, i even tried a teat that’s usually too fast for her and it still gets blocked she gets wore out and goes to sleep I think it’s something to do with the way the gaviscon is reacting with the sma althera because this didn’t happen when I mixed the gaviscon with cow and gate