I'm shooting an 18 month-old today, and most of the shots will be indoors, using available window light and bounce flash. I feel like I can get decent bokeh (enough for what I'll be going for during this shoot) with my 24-70L at f/3.2 or 3.5. So is there any reason to switch between the 24-70L and my Sigma 50mm 1.4 for this shoot? I feel like an aperture less than 3.2 or 2.8 while shooting candid shots of a toddler would be too risky in that I may not get her entire face in focus. Am I wrong on my thoughts here? Any reason to switch between lenses today (or just keep the 24-70 on the whole time)?