It’s a known fact that a witcher’s mutations render them unable to reproduce.

Some prerequisites must be met for this letter to appear, however.

Namely, an imported save of The Witcher 2 with the corresponding quest having been completed.

The Witcher - Geralt Curing His Infertility

One looks like a peasant, while the other seems to be some sort of professor.

The dialogue between the two leads with “Here comes the witcher, think he’ll agree?”

then more unsure muttering and a snippet about Geralt being the ideal candidate.

Geralt-Triss-Baby-The-Witcher-2-fan-art-edit-user-Leyla-steamcommunity

Via steamcommunity.com (Custom art by steam user Leyla)

Interacting with this pair will reveal their wish to test an uncertified alchemical substance on Geralt.

If Geralt agrees to participate, then he takes the potion, and that’s that, quest complete.

From Oxenfurt’s Western Gate, head south (right from the gate) and cross the bridge.

Witcher-Eperimentations-cont-letter-3-2-reddit

Via reddit.com

will be lying at the statue’s base.

Unfortunately, this means there is still no hope of making little Geralts with his possible end game romances.

The letter is dated towards the end of events in The Witcher 2.

Triple-A Games

This revelation will certainly have Geralt scrutinizing any recent exploits in the Passiflora and other similar establishments.

Source:YouTube

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The Witcher 3