From A Wiki of Ice and Fire
|Book(s)||A Storm of Swords (mentioned)|
A Storm of Swords
Either Anguy or Tom of Sevenstreams impregnated Fern. Sharna is at Lambswold helping Fern deliver her baby when Brienne of Tarth, Ser Jaime Lannister, and Ser Cleos Frey passed through the Inn of the Kneeling Man.