Season 5 "I never wanted to have a child"

Quick question. I can't remember back that far...was this the first time Irina has told Sydney that having her (Syd) was a task? Did Sydney know before "Maternal Instinct" that Irina never wanted to have a child? Just wondering. I think Jennifer Garner played the reaction quite well...stunned. But I wanted to know if this was the first time Sydney heard this.