Hello everyone! My daughter is 9 months old now and lately she pulls o…

Hello everyone! My daughter is 9 months old now and lately she pulls out her hair before bed (when breastfeeding). Or maybe she just relaxes like that I don't know ? She has front teeth coming in, one has already come out, the other is still going... it's just been poking through. Could this be the reason? Also, she's become more capricious, constantly crying.