Why does my baby pull her hair

Dolores

So lately my baby has been pulling her hair is that normal ... I’ve noticed she does this when she’s like yawning, when she’s hungry, stretching her hands out, crying. I would like to know if other babies do this too because I did search it up but it said that pulling her hair might be a sign of autism... can any one please let me know if thats normal ...she’s turning 3 months.