Do you shake or just swirl?
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I shake the bottle really well & make sure there isn’t any formula stuck to the bottom of the bottle :)

I shake really well

I swirl it around with a dash of boiling water, then add cooled pre-boiled water to the level required. Shaking can add alot of extra air bubbles which doesn't help gas.
However we still had a very grizzly baby when it comes to wind, so we started adding infants friend to each bottle and have noticed a huge difference in him