@Mamabear04 we had a week of her just constantly screaming, refusing to sleep through the day, it was awful to see her so upset so we gave her the week to see if anything changed and when it didn't we decided to try and help her.
From birth she has slept in a cot bed in her room with me in a big bed on the opposite side. We tried a next to me crib and she hated it so just went straight to cot. She was on off with dummies at the point of her regression with the odd thumb suck. Since birth she's had the exact same bedtime routine too with the only difference the time we start it (first few months it was variable depending on her, from regression we set the time as part of her training).
We put up a blackout blind in the nursery, set the lullabies up on the cot camera and put a ssshhhing bunny next to her cot. Laid her sleepsack in the cot so it was ready to go and set the Huckleberry app (used it since birth) to 4 nap days with 7:30pm bedtime.
So starting from bedtime routine:
6:30pm bath
6:45pm into nursery with galaxy lights on for dry off/pjs/nappy/sleepsack. Very chilled, low voices, dim lights.
7pm low lights, read books, snuggle binky, have a bottle and burp.
7:30pm put lullabies on, put ssshhh on, lights out and lay her in cot bed.
10:30pm dreamfeed full bottle, gentle burp, back in cot.
3-4am ish small bottle if she asks, 2.75oz usually, gentle burp and back in bed.
6:30-7am wake up, snuggle and a bottle/burp.
Then its nappy change, clothes on and onto her mat in the living room for tummy time, roll over practice, toys.
We use huckleberry to tell us when her next nap will be, if she eye rubs/yawns/whinges/gets red eyebrows before this time we take her to nap. If she lasts ok we usually head upstairs 10/15 minutes before the app nap time.
For naps its dark room, lullabies, ssshhh, sleepsuit. Lie her in cot and leave immediately. She does whinge everytime she goes down (not crying) so we just watch her on camera and listen for crying. If she cries the 5 minutes start. After 5 minutes if she's still crying we go in quietly, pick her up and cuddle until she stops. Pop her back down and repeat. Longest cry was 8 minutes. She uses her thumb to soothe to sleep.
She tends to stir or wake up around 35-45 minutes. We leave her and watch on camera, she usually sucks her thumb back to sleep, if after a few minutes she's still awake we go in quietly, pick her up and try to cuddle back to sleep to put back in cot. Sometimes works.
I feel a bit dramatic saying it changed our lives but it feels that way! I can actually do things during her naps, we get couple time on an evening.
O and I also make sure to give her one nap a day walking in her pram so she doesn't lose the ability to nap outside her cot. Fluffy pram insert, pram hood all the way down, pram fully reclined and she goes out like a light. Also naps in carseat in full sunlight.
Honestly for us it was just the best thing we did with her!