I don't know the answer, though I'll look it up later if I have time. However, even if they are low, I wouldn't have thought that a short-term episode of low dietary potassium would be sufficient to harm a baby. Serum potassium concentrations are much lower than intracellular concentrations, so the baby should have a lot of stored potassium and will readjust serum concentrations if less is coming in. I'd recommend checking that with someone who knows more biochemistry, though!
Best wishes,
Dr Sarah Vaughan
MBChB MRCGP
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