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Time for theories!
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To be honest, I've been thinking about the Geldris' baby for a long time now.
I've had many assumptions about what gender he'll be, what clothes he'll wear, what his personality will be, and most importantly, what his relationship to Tristan and his family will be...
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I always thought it might have been a girl. Just imagine a little girl who looks like her daddy in more ways than just looks and looks! That would be so darn cute! And Zel and Gelda would be crazy about her!
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But then, more recently, I assumed it wasn't quite in canon, so I reconsidered my previous statement.
In the legends, Tristan had an uncle named Mark, who was his mother's brother, whose jealousy grew because of Isolde, eventually killing Tristan.
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In SDS, Tristan's only uncle is Zeldris, but as we know that's SO not right for him, so the only suggestion falls to his cousin, which is Mark.