Please dont cry. The face reacts to the
microphone's input. Laughing when hearing high frequencies and crying when hearing low/mid frequencies. The
reaction on mobiles is based on the gyroscope (facing the phone up/down). Made with P5.js.
To design the baby's expressions, I tried to find what would be the minimum changes to express surprise, happyness, and sadness. By parametrizing the three moods with some dots I could then interpolate them, so I could switch smoothly from one to another (hover the mouse over the rectangle bellow, or face your phone up/down. It might not work on iPhone though, check it out on a laptop instead).
Shaping it with some ellipses and bezier curves: