Rule of thumb (not really evidence-based) in the UK and elsewhere is that babies can lose up to 10 per cent off their birthweight in the first days without it indicating a problem. It's as useful a rule as any, and a baby losing more than this probably does need checking over to see that feeding is going ok. In fact effectively feeding babies don't usually lose as much as this, and every mother needs to know the signs of effective feeding which are more than just what the scales say. So a baby who's lost more than 10 per cent (weighed naked, on digital scales not spring balance) does flag up the possibility that feeding needs fixing - but formula is almost certainly not necessary unless the baby is actually already ill or dehydrated.
TikTok, thank you for responding, I`ve always had the impression you give sound advice. DD has not been ill at all, on the contrary, she was an easy birth 10/10 apgar rating and I´m told she is very alert etc.
You say: "I sugested increasing feedings and supplementry pumped milk for 24 hours and see if weight improved" Very sensible. In addition, someone who knew what to look for should have observed a feed.
"Day 5 weight had stabilized and doctor still not happy."
I don't know why - stabilisation is good!
" I was told to exclusively pump and make up that amount to a 90 ml bottle. Which I did. the next day had a 20 g weight gain and we were allowed home." Your baby had started to gain - great stuff. Would be useful to have a weight now, so you could say your way forward to just direct bf, with no expressing.
" Did they panic? "
It sounds more that they don't know how to fix a less than perfect bf situation.
"Should I have just continued bfeeding and pumping extra?" On the basis of what you say, I can't see why not.
BTW - again, if she really does have diarrhoea, you need to see a doc asap.