Infant won't stop morphing randomly

I've noticed since this recent patch update my infant will randomly morph I just started keeping track of how often this happens and these screenshots are 1 sim day apart. I tried to include the interaction and mood of the infant. It's not super frustrating but I have noticed this only showed up after the recent patch I have never had this issue before. I'm not sure if it helps to know he unlocked the sit up milestone.