Lip biting as part of teething

Hi mommies! Is (lower) lip biting a symptom of teething? My lo's 7 months and has been doing it for about a month na. Aside from that, mahilig din sya mag-suck ng fingers and anything na mahablot nya. Also, parang mas tahimik sya (less cooing/ babbling) when he started teething. Thank you po sa mga sasagot. #firsttimemom #firstbaby #babyboy #teething #speech