I suppose I'm just confused as to why, a couple of weeks ago, she'd be asleep with minimal input...
Sleep isn't linear.
It is not the case that baby starts off as a terrible sleeper and gradually gets better with age. Sleep is going to be very up and down for the next couple of years at least - these regressions (where previously good sleep goes rubbish) is very likely to happen many times up until your child is around school age.
Could be one of many reasons for the regression - emotional development, physical development, illness, pain, teething - there are loads of reasons. Fact is, regressions will happen, and will happen several times, so you need a plan for what to do when sleep goes rubbish.
It is a plan to decide when DC's sleep is rubbish that you'll feed to sleep. That's fine as long as you accept that to get out of the regression at the other end you'll have to re-sleep-train. You'll also need a plan for what to do when you have a regression when older and you're no longer breastfeeding.
Alternatively, you could have a plan for giving baby extra help to sleep independently. So support and help baby to continue to go to sleep in the cot (rather than out of the cot, being fed). That way you can give the extra support when it's needed but then withdraw when it's not needed.
NB - Feeding in the night (at this age, would be different when younger) is likely to be causing confusion due to the lack of consistency.
To help baby learn to go to sleep in the cot, your baby is going to cry. Without a dummy for sucking on, that is likely to be a lot of crying. But the idea is that you stay and comfort (rather than leaving baby alone, as with controlled crying). That way, you're teaching yourself ways to comfort her in the cot, at the same time as she is learning. So then when you next face a regression, you have more tools at your disposal to use to give her extra comfort in a way to support her to sleep independently.
My suggestion would be
- Fully seperate feeding and sleeping
- Into cot fully awake
- Your hand on baby's chest quite firmly (you're aiming to keep her still, but gently)
- You leaning into the cot with your face as close to baby's as you can. Lots of calm, reassuring eye contact and compassionate composure, so dont get stressed or angry because she's struggling to learn
- Shush into her ear and pat with your hand if baby is distressed. But as soon as baby is calming, stay silent and still your hand (but keep it on chest)
- If squirming and thrashing, lift baby upright to your shoulder and immediately lie back down and back to hand firmly on chest. You're lifting to reposition not to comfort out of the cot; do all comforting in the cot
Then just keep repeating this over and over and over again. Yes, she will cry, she will cry a lot. It will take a long time but you'll be there with her.
Then, over time you'll need to pat and shush less and she calms more quickly, but keep your hand there and bend close for reassurance.
Over time from that, you start doing the hand on chest and bending close only if DC is unsettled, otherwise you remove your hand and step away when baby is calm. But go back when needed, if upset. Once she trusts that you'll come straight away if she's upset, she'll gain more confidence in sleeping on her own.
The idea from here is that during regressions (which are inevitable) you might need to go back in and offer extra reassurance for a bit. But then you have a pathway to withdraw that extra help as baby feels more settled.