As far as the brand really any will do, folks on here use all sorts of calcium citrate pills (the ones for humans) with different dosages and it doesn't seem to matter terribly much? I get ones labeled "petites" simply because it's a lower dosage and a smaller pill is slightly easier to slip into their mouth.Can you tell me the brand of calcium pills you get? are they hard or chewable? Thanks!
That said at 8 months old I wouldn't be surprised if the issue resolves without intervention, as newer layers can have all sorts of temporary glitches.