red - many HCPs - I mean many - will tell a mother to supplement without doing the careful assessment I have described. They also tell a mother to supplement without informing her that this intervention has risks, and may affect her long-term choice to breastfeed.
Heck, many of them tell mothers to do this without even suggesting she breastfeeds more often, or uses breast compression, or 'switch nurse' (going from breast to breast and back again several times), or expressing and supp'ing with ebm....they suggest supplementing with formula at the drop of at hat when many babies either i) do not need it or ii) have not tried improving the breastfeeding first.
Personally, I don't tell mothers what to do, in real life or on here. I do suggest they speak to the HCP who has told them to supplement and discuss fixing the breastfeeding, or feeding more often, or whatever, or ask more detail of the HCP if the reason for supplementing is not clear.
It is very common for babies to be supplemented unnecessarily,
I have never, ever told anyone to 'ignore' what the HV says (unless it is truly preposterous, and sometimes it is!).
The research on IUGR (pre-birth poor weight gain) is a different clinical area than post-natal weight gain - most babies with faltering growth postnatally are actually just fine, and the risk is that you intervene unnecessarily and mess things up (not to mention the parents' confidence). I think the study I read recently said it's only 5 per cent of babies who present at hospital level with faltering growth actually have anything 'wrong' - they just recover spontaneously with no ill effects. Obviously, you need to be able to spot that 5 per cent, and not worry the bejabers out of the other 95 per cent...and treat them, if at all, by watchful waiting in the community without sending them to the paeds.