OK, red, then a baby who just seems to be 'not getting enough nourishment' (but is not actually ill) should still be assessed. Is there a hidden organic reason why she is gaining slowly (heart defect, lack of muscle tone leading to poor feeding technique, tongue tie)? When that is ruled out, is the mother feeding often enough? has the mother tried scheduling the baby and has therefore reduced the baby's access to the breast? Is she feeding on one side only at a time? is the baby a using dummy and bf less as a result?
In other words, can we increase the baby's intake of breastmilk in some easy, non-interventionist way?
And how accurate is the weighing? There are papers which show how innaccurate this can be (scales, operator, mis-reading etc ). Is the chart used an appropriate one (after 5-6 mths, standard UK charts are misleading)?
Also, does this baby need to be supplemented now, and if so, can it be with ebm?
All this is so rarely done, and yet the world agrees it is good practice and evidence-based!
We actually don't know if there is a cut-off point in time (how many weeks) or place (the dot on the graph) a baby has to be before you must supplement - this is a judgement call.
You want me to say, 'yes, of course, when a baby has fallen x lines for y weeks, he has to have formula'....and it would be wrong to say it. 'Cos babies, and life, and feeding don't work like that.