Not fair! ;-)
I would take the 17-55 zoom for the versatility (or my 15-85 zoom if it is a sunny island and I'm outside a lot). I would always recommend one high quality zoom first before adding primes like the Sigma 30, or the 35L or one of the 85mm lenses. The zooms cover a lot, from a group shot with grandparents and in-laws around the baby, to portraits of the baby's face. That's why they usually stay on the camera a lot, and you can take a lot of different pictures without swapping lenses in between, so it better be good quality, and for your purpose, it better have a wide aperture/low light capabilities.
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Then I'd add a prime later, either a 30 or 35, or a 85 if you prefer tighter head/shoulder portraits. But thekingb and Richard also have a point, use the existing kit lens for general purpose and add a 30 or 35 prime with even greater low light capabilities than the 17-55. Looking at my neighbor's pics of his baby, he get's a lot of good pictures out of the 17-55 with 2.8 aperture, so I would still recommend it as the first purchase.
As you can tell by the length of this thread and the other threads you found, there is not only one right answer. All the recommended lenses are good, the questions are
1) where do you put your money first, and
2) out of which lens will you get the best value for the intended purpose?
My money is still on the 17-55, then a flash, then a faster prime or a tele.
Let us know how you decide, and please share some pictures.
Good luck!
Arnt





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