Breakdown of O babador ficou sujo de papinha, então vou lavar agora.
Questions & Answers about O babador ficou sujo de papinha, então vou lavar agora.
Ficou sujo means became/got dirty, so it focuses on the change of state.
- O babador ficou sujo = the bib got dirty
- O babador está sujo = the bib is dirty
In this sentence, ficou is used because the idea is that the bib was clean before and then became dirty from the baby food.