Scrunchy Face and Heavy Breathing

So for the past month or so, Mathis sometimes scrunches up his face and starts breathing heavily through his nose. Maile did the same thing around the same age. The photos of Mathis are from 11/15 when he was 10 months old. The video of Maile is from when she was a little over 10 months old. I think most of the breathing you hear in the video is from me.