To be sure of a food or drink causing an effect in the baby we'd need to do a properly controlled experiment, preferably blinded (so you didn't know you were eating salmon or cabbage or whatever) , and then have a week when you didn't eat this thing (and didn't know you were not eating it!)...and then repeat the whole thing at least twice a few weeks later, keeping records of the baby's behaviour each time.
This is all a bit difficult
Instead, we guess - we eat X and then the baby is unsettled and so we link X to the unsettled behaviour. But as babies are unsettled for a zillion reasons, not always gut related either, it's absolutely a guess.
I never know how people can tell the baby has 'trapped wind', sorry - people say 'you can hear it inside' (but you put your ear to anyone's stomach and you can hear all sorts), or 'his tummy gets hard' (the tummy naturally gets hard with crying) or ' he burps and is better afterwards' (but babies burp, and their mood changes, and it may be unconnected).
Alcohol making babies sleepy? Not four hours after drinking - the alcohol is processed and is completely disappeared after 1- to 1.5 hours per unit...and the amount of alcohol needed to show behavioral change in babies (and this is based on experiments) is massive, and far more than a glass of wine. But I suppose individuals can have individual responses, so I am not saying you are wrong, becky
I would say that any effect of soft fruit on the baby's poo is total coincidence, though, sorry!