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This is plain, but is this good writing? Specifically, I find the writing lack of specifics.Specifics are only worthy when they are needed - that is, the core message changes without them, or the level of specificity is inefficient to convey it. This is not the case here.
>What is "early"?
Earlier than with a regular pregancy. For the intend it wants to convey (that she is autistic and deaf because of a premature pregnancy) that she was "early" is enough. If he said 6.5 months as opposed to 7 would it matter and change anything? It might even muddy the waters - if he wrote 7.6 months one might argue "hey, that's not too early" and start debating that, when the main thing this passage is intended to convey was that she was indeed born early.
>What is "very small"?
Much smaller than an average child, enough to be a result of early pregnacy and a factor for the aforementioned issues and other health concerns. Again, would exactly kilograms make any difference?
>What does "has trouble" mean?
That she doesn't see/hear/eat/and sleep as an average kid but worse. Would specifics ("she wakes every 1-2 hours" or "she can only hear under 9Khz") make any difference?
>Good writing is plain and simple. Being plain and simple does not mean bland or vague.
This is not supposed to be "good writing" whatever this means. This was intended to be "more readable" by a specific target audience.