Low breaths per minute (17-18)

Our almost 7 month old sleeps great at night, but I’ve noticed over the last few months her breaths per minute have gotten pretty low. She’s down to 18 breaths per minute regularly throughout the night, and I’ve even seen it at 17 BPM. According to Nanit’s chart, 19 BPM is the low end for a 1.5-2 year old, with