We started solids at 4 months and noticed a significant improvement. It was earlier than I had wanted to start, but DS was already on the max dose of Losec and was still having issues.
Like a pp said, suspension is supposedly more unstable. We found the tablets much better.
You may already be doing it, but other measures (upright after feed, angled cot and change table) also helped. With solids we also avoid or minimise onion and acidic foods as DS' reflux gets worse with those foods still at 13 months.
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