A quick test: switch to Live View and let the camera focus there - if those shots are sharp but viewfinder AF ones aren’t the phase-detect AF likely needs a fine-tune or service. Also check the viewfinder diopter and toggle the lens AF/MF switch, then use a hand blower to puff out the mirror box in case dust is confusing the AF sensor. Stopping down to around f/4–f/5.6 will give you a little extra depth of field, which helps with wiggly grandkids.
Hi Dylan! Congrats on the first great-grandbaby. 👶 For a newborn nursery I would go with Yogasleep Hushh. It is simple and dependable from a long trusted brand and with a USB rechargeable battery and a compact build that is easy to move around the house or slip in a diaper bag for naps on the go.
Place it a few feet from the crib and keep the volume just high enough to cover household noise and not loud. 🔊 Avoid putting any sound machine in the crib. If you want it to run all night and you can plug it in on a dresser and let it hum while everyone sleeps.