Yes, but all of the above information still indicates that zoloft is undetectable to non existent in nursing infants. I know you are not trying to be snotty, and I do not take it as such, but sometimes even the tiniest seed of doubt is enough to deter someone who REALLY needs meds from taking them. Meds are scary for some people, especially people with anxiety or OCD. But they are SO helpful to SO many people, and when the risk to baby is so small to none, they are well worth taking.
I have to take other meds for asthma that are L3 and were category 3 while I was pregnant. No ill effects on either child. You have to keep things in perspective... I needed the drugs to breathe, to get air to my babies. Same with depression meds. A mother needs them to live sometimes, to give to her child a perspective on life that is positive. In some ways, that is like air to breathe. It's all necessary for life. So if a mother needs meds, to be a good mother and to function, then they are so well worth it.
Also, there are many studies out there on the effects of a depressed/anxious mother on baby. Having that is SO much worse than having a mother who is medicated, even if SO small of an amount gets to baby.