I have four. Never really had an issue with this with the first three, but the last one will put ANYTHING in her mouth. i try my best to be super-vigilant, but honestly sometimes I dont know what she has swallowed UNTIL I find it in her diaper... A teeny balloon piece, a bead from a necklace, stickerS, and more that I can't remember right now. She is almost three and still puts stuff in her mouth... the grossest of things. She doesn't have a vitamin deficiency, just likes to taste dirt, rocks, the bottom of her shoe, her toes, BUGS, her nose-business, etc. EW! Big EW. I know it sounds like I'm the crazy mom, but I swear it is her (lol). She is also the sweetest, most thoughtful, cute, smart, loving pretty feminine thing, and then she has this habit...
You should be cautious (look for it in diaper), but your baby will probably be fine. I think all kids have additional angels to look out for them when they do these things. Good thing the little one didn't choke. Surprisingly and thankfully, my little one has never choked either.