Nonsence and hoping you can ignore.
I had the same but in reverse. DS was massive at birth, undiagnosed gestational diabetes was suspected.
So, once home he did lose weight, as I was told would happen, until he reached the weight that he was supposed to be without all the blood sugar he got from me.
Hv freaked out and told me he was ‘failing to thrive’ because he was going down the centiles. As he started off the chart and went down to I think 90% ish at that point, and had so many rolls of fat it was unbelievable, he was absolutely fine.
But the hv told me that the gestational diabetes was ‘irrelevant’, and every baby needed to track exactly along the birth weight percentile, and therefore I was starving him!
Cue lots of really crap breast feeding & top up formula, which of followed would have ensured breast feeding would have stopped and I’d have had that to feel a failure about along with everything else I was feeling at that stage.
I’m sure there are some amazing health visitors out there. Sadly, I’ve only ever met one (who wasn’t in my borough). Oh and some great hv post on here so they definitely do exist!
Unfortunately, in my experience, the others have given. advice that melds old wives tales and outdated medical advice with scare tactics and black & white rules that didn’t reflect real life.