I noticed my 6mo was a little acting a little odd

🐘🐘🐘 • 👧🏼 born 1/19/16. 👼🏼 lost 9/15/17. 👼🏼 lost 11/26/17.
She's been very cuddly, attached to me, and sleeping a lot.. Well today she left a huge hickie on the top of my boob after a feeding and I checked her mouth... 
Teeth number 3&4 are peeking through! Fourth one is the same tooth but on the other side! My poor baby!!