4 month sleep regression

[BeyonceKnows]

My daughter is 4.5 months and she's wonderful.
She's generally happy, she naps well in the day (usually in the pram). She used to sleep from around 11pm until 8/9am which was AMAZING. Note, this sleep was in her basket and it wasn't easy to get her to sleep but once asleep, she would sleep til the morning.
However, about 2 weeks ago, she just stopped. She will not sleep in the basket. We've started rocking her to sleep (I was feeding her to sleep but realise this is a bad habit). This takes around 20 minutes of SCREAMING. Once asleep, she would stay asleep on us but the second we put her in her crib, she's wide awake and screaming again. No amount of patting/shushing/rocking gets her back to sleep. So we take her out, rock her again for 20 minutes and continue FOREVER.
Because we literally cannot get her to sleep in her basket, we've been co-sleeping (safely) but she feeds all night long. She just helps herself while I doze but I am aware of her and it is pretty constant all night so I'm worried she's a) reliant on feeding to sleep. And b) exhausted in the day because she's not getting good quality sleep at night time.
We're really struggling. Bedtime is such a battle, it's really upsetting me.
Also, I keep reading everywhere that the 4 month regression sets them up for how they'll sleep forever so I'm now panicking that she'll never learn to sleep without feeding constantly.
I'm really sorry this is so long but I can feel myself becoming really down with this.
My questions are...
Does this sound like a regression/growth spurt?
Has anybody co-sleep through the regression without messing up their child's sleeping forever?
And can you die from lack of sleep?

Please be kind, I'm really struggling at the moment.

A lot of responses will tell you to co sleep through it and manage best you can. I honestly stressed about this regression for SO long and it did come, it came about 14,weeks I think. Anyway she woke 3 times a night, started only sleeping 30 mins at a time in the day rather then her usual 2 hour nap. After about 3 weeks my mum said to me she was sick of hearing about me going on about regressions and all the other things she had no clue on back in the day. I've heard a lot of people say "were 10 months in and sleep is still the same now". I personally believe in sleep training and it did it once she hit 4.5 months old. A lot of mums out there don't agree with it and say that's too young, every older mother I know told me there's nothing wrong with letting them have a little cry when settling for bed and not rushing to them the moment they start. So I stopped rushing to her basket every time she went down, and left it 2 minutes. Then again, then again. It took a few nights and she self settles wonderfully now. She sleeps through the night but only wanted her dummy when she was waking. (i do ff tho so i know different to bf) I would see how you go for a couple of weeks and I think sleep training is the other way to come out of it or you will be one of those mums who's 1 year old still wakes up 100 times a night. I think all this new information we know is good but also puts the fear of Christ into us mums and what we should and shouldn't do. You're the mum and only you know best for you little one, what worked for me might not work for someone else etc, all babies are different so I get that. Good luck x

We had a sleep regression of sorts at around 4 months, however not to this extent

I too worried about ‘creating a rod for my own back’ as lots of helpful people would say but in all honesty you have to do what is right for you and your baby

To get through it we occasionally co slept and I would feed (formula) on pretty much every wake up. At this age they’re still growing so fast and for me It made sense that he was also going through a growth spurt so would be hungry. I do know that some babies Bf for comfort as well which isn’t as easy to do with formula so not sure how you get around that

It soon passed though and DS was back into his next to me within a few weeks no issues. He’s now the other way and refuses to co sleep even if ill

Just to add I’m not adverse to sleep training but have now only done a bit of the Ferber method once he was over a year. I believe gentle sleep training isn’t advised until 6 months but for me I felt he was ok without it as wake ups were always linked to a specific reason eg growth spurt, teething etc