We have been using the Owlet for our now 4 month old since she was born. I love having it as it lets us both rest easier at night without me waking her up trying to make sure she's ok. However, as she's getting older the heart rate readings make me anxious. I know the rates get lower as she gets older, but the rates seem to jump around quite a bit. Within a few seconds it will jump anywhere between 110-80 while she's in a deep sleep. Her oxygen level is always good and she is always sleeping peacefully. I'm curious to hear of other's experiences with the readings. Do you notice fluctuations in the heart rate and could you share what tends to be normal for your sleeping babies?