Is it bad if your bird does some sloppy poos?

Lately my bird has been doing many sloppy poos, so two days after i thought that it was abnormal so i took my pet cockateil to the vet the advice she gave was that my bird had diarrhoea and it my be because of the diet. In the end my bird turned out ok she was just going through a phase and it was a normal thing. But if your worried about your bird after 1-2 days of sloppy pooing then i suggest you call the vet. -GOODLUCK-