4 month old suck on a candy cane 🤦‍♀️

Well it’s not the end of the world but I went inside while my sister in law was holding my son and I came out, I seen some blue stuff on his chin so I asked her what’s that and she said she gave him a suck of her candy cane 🤦‍♀️ I have made it clear I don’t want him having anything until 6 months old, it’s my choice and she doesn’t agree with that 🤷‍♀️ I didn’t even know what to say but annoyed is an understatement and out of all things you give him some candy!!! 🙄 geez.