@Hannah Nope hot water, 25 mins after the kettle has boiled.
Maybe not mixing it as well? I use the bottles with Hipp formula (and aptamil previously) and would get bits in when i didn’t mix it enough. People often swirl instead of shake to get bubbles out but it often doesn’t mix well enough
I mix it with a spoon then give it a shake before I put it in the fridge when I make bottles x
Do you make the bottle up in cold water? The formula dissolves better in warm water. Looks like little bits of undissolved formula? Shame the dr wasn’t more helpful.