When my daughter was a newborn she could sleep through a storm we constantly were making noise in kitchen, had tv loud, and played music really loud and she wouldn’t so much as move. She experienced really bad colic her first month due to milk allergy and I had her in very quiet settings in order to get her to sleep . Now we so much as close a door too hard and she wakes up and it becomes very difficult to put her to sleep . Please help
Have you tried a sound machine? I think its just going to be a matter of training her again. You can look up information on sleep training.
get a white noise machine. If the room is silent any noise might startle them. but if you have white noise running it becomes normal for them. also a good swaddle might help too.