Hey mamas, being that my son is 5 I forgot when his first teeth came in. My daughter is 3mths old…

Hey mamas, being that my son is 5 I forgot when his first teeth came in. My daughter is 3mths old and she's been super drooley and the last 2 days she's only been truly happy when she's nursing. She's not "bad" in the meantime jus restless like. She's also not napping during the day. And she's accepting her paci which she normally doesn't. I'm wondering if it might be teeth? Cause this isn't how she acts during her growth spurts usually.