<p>Thank you all for your responses, and thanks for the congratulations :)<br>
The newborn photography book I've been reading, would definitely recommend it, is on Amazon called "Natural Newborn Baby Photography". Being able to search the text using Kindle, I'm able to find the captions of every single photo sample the author included in the book. 99% of her photos were taken with her 50mm lens at f 1.8. And her photos are amazing. Not saying you can't get the same quality at other apertures, but I am saying she knows what she's doing. This motivated me to get a prime with an aperture larger than 2.8 (either of my zooms). <br>
Thanks Greg for your mention of the Canon 50mm STM - I hadn't even seen that one yet. Doing some reviews and lots of research, it came out just a month ago (May 2015), and at the same price point ($125) has a lot of new upgrades, including quieter AF, 7-blade aperture vs 5, potentially slightly sharper images than the 1.8II, metal mount vs. plastic, etc. So, I got that one! I'm excited for it. <br>
My only worry, though, is that, especially because this is my child, and our first child, and I don't want to screw things up, let alone the pictures since that's my thing, would I be "ruining" my newborn photos using the Canon 50mm 1.8 STM vs. if I paid more for the Canon 50mm 1.2L? Would the pictures come out significantly different (worse)?</p>