| Spoiler warning!|
This article contains plot details from the latest books.
In the future books, this alicorn will be very important. We do not know the gender yet. Because there are only two known alicorns in the Elvin world (Greyfell and Silveny), it is very crucial for this baby to be born. We are not sure how far into the pregnancy Silveny is, but unicorn pregnancies last about 11 months, so alicorn pregnancies probably last about eleven months.
We learned about the pregnancy in Book 4, Neverseen.
In the book Nightfall, Silveny was acting strange, and didn't want anyone to check on her. She convinced Sophie that she was safe, and so was the baby. When she finally came because of Amy, she still wouldn't let Edaline check her, but she looked fine.