Two cases, let's look at similarities and differences.
Woman A: I was sexually assaulted.
Woman B: I couldn't breastfeed.
Similarity: in both cases, the statement could be interpreted in two ways.
- As a statement about the woman's perception: her own internal truth.
- As a statement of objective truth, that would be recognised by someone else who knew all the relevant hard facts.
In sense 1 we should probably always believe both women. It's conceivable that either is not telling the truth about her perception, but it's so vanishingly unlikely that we needn't really bother with that possibility.
In sense 2 we have to be more careful. We still have a legal process: if Woman A was alone with Man X, and there's no evidence but Woman A's word, we may not go so far as to jail Man X on her word alone, if he says he reasonably believed Woman A consented because blah blah. When we say "we believe you", sense 2 isn't what we mean. That's uncomfortable so we normally brush it under the carpet, but it has to be so.
The reason to be careful about sense 2 in Woman B's case isn't so obvious, but it's still there. The more times a woman says "I couldn't breastfeed" in the company of a group of women, some of whom are ignorant about breastfeeding, and everyone accepts the truth of the statement, the more people who haven't yet breastfed come to expect that they might not be able to breastfeed, and the more people who might have wanted to breastfeed and been able to give up because they were expecting that they might not be able to and so when they hit difficulty they assume that's what's happened. We've come a long way away from that in recent decades, but only because of all the work that's been done to emphasise that breast is best and most women can breastfeed. (The younger among you won't remember before all these initiatives.)
In the present environment, it's more comfortable to say "I couldn't breastfeed" than to say "I chose not to breastfeed", especially if your internal truth is something more like "I chose, but it wasn't a free choice, because the environment around me made it incredibly difficult to go on, and maybe if I had chosen to go on I might have been able to solve my problem, but maybe I wouldn't have been able to, and I'll never know because I didn't take that path, and really this is none of anyone's business". That's understandable, but you get challenged because what you said may not be strictly true in sense 2. If you don't like that, you might want to choose a different formulation, such as "At the time I perceived that I couldn't breastfeed".