The baby has been hanging on his/her chest for two days now, even at n…

The baby has been hanging on his/her chest for two days now, even at night I had to put him/her to sleep with me. All night on the chest in the mouth, as soon as I remove it, he/she searches immediately. This is the first time we've seen this? Even during the day, he/she doesn't sleep normally if not next to me, even doesn't eat but just holds it in the mouth, we're trying to soothe him/her but it doesn't help, he/she searches specifically for the breast. Has anyone experienced this? How long did it last? Never hung on the chest before, even didn't fall asleep on it for a long time