Girls, I don't even know what to do anymore, the baby just won't sleep…

Girls, I don't even know what to do anymore, the baby just won't sleep at night, he only falls asleep while I'm feeding him. As soon as I put him down in his crib, he starts crying. It's been two nights already! I can barely sleep. He sleeps during the day. Before my husband's parents came, everything was fine. He used to fall asleep around 2 AM and wake up at 5 AM to eat and then go back to sleep until 9 AM. Now it's like something is scaring him, he cries so much that Mom is going crazy. I think it's probably because there are too many people and it's noisy, and the baby