9 month old wakes every 40-60mins for last 3 months!

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Please help! My 9mo was previously quite a good sleeper. Would wake around 12 and 4 for breastfeed and sleep pretty solidly in between. Since about 6 months old though she has been waking constantly throughout the night. Literally every 40-60mins.she doesn't want feeding just cuddling back to sleep then I go to bed and she wakes up again sometimes only 20mins later. I thought this was a regression or phase but this has been 3 months now and I'm losing it. Please help!

Would you be able to describe her bedtime routine and how she is falling asleep?
Brief outline of a typical day food wise would also be good and some more information regarding naps (times and durations?)

Just wanted to say my 6 MO has been doing the same the last couple of weeks. We had a bad week or so which I think was due to teething and although she’s better now she’s still very unsettled on and off throughout the night. She goes to bed fine and will sleep soundly from 7-12 and then after that she needs resettling every hour or so until morning. I have no advice but just wanted to let you know you aren’t alone!!!

Same!! 9 month old here too! Help me!

Typical day is
6 wake and breastfeed
7 breakfast (usually weetabix/porridge)
9 nap 60-90mins
11 snack (fruit or egg/cheese)
12.30 lunch (sandwich/soup)
13.30 breastfeed and nap 60-90mins
3pm snack then usually out for walk
4.30 breastfeed
5.30 dinner (pasta/chicken/fish followed by yoghurt & berries)
6.30 bedtime routine usually asleep by 7 usually bf to sleep.

Sleeps quite well til 11pm then wakes every hour at least and needs cuddles back to sleep. Ssh pat does nothing.

How would you feel about waking her once that morning nap hits 30 minutes? Then perhaps you could bring lunch forward slightly to 12 and aim to have her down for the afternoon nap by 1 latest? Then see if you can make sure she's definitely not falling asleep before 7 in the evening. Particularly if having dinner at 5.30, possibly aim for asleep by 7.30 rather than 7. Just a few little tweaks but I'd hope to see some improvement with those.
When you say 'bedtime routine' what exactly does that include?

Thanks I will try all of that. It's usually bath or wash, get her dressed quietly, quiet story and cuddle to sleep in chair. Sometimes she'll have a feed, sometimes she doesn't want it. She's fine about actually going to sleep. It's just the waking up

Sounds like a lovely bedtime routine! As you're pushing bedtime slightly later could you try cuddling/feeding till she looks drowsy and then putting her down awake with some shhing and patting if she cries? I understand this hasn't worked for you previously but would you be happy to give it another go alongside the routine tweaks?
Also, when putting down awake and for any night wakings make sure to give yourself a second to think about whether you can hear crying or noise. Sounds silly I know but particularly in the middle of the night we can rush to respond too soon when baby was actually just having a little chat to themselves or wasn't even awake, just making some sleepy noises!

Thank you so much for your help. I've adjusted the timings as you've suggested today. Will see how she gets on tonight.

I used to be able to put her down awake and she would smile, roll on her side and go straight to sleep. Now she will only be cuddled to sleep. If I try putting her down drowsy she wakes up fully and I have to start again from scratch.

She goes to sleep with a cuddle but then keeps waking less than hour later and needs cuddling back to sleep over and over.

I don't go in unless she's properly crying as she does make a lot of noise in her sleep.

Have you tried wake to sleep method? My DS went through a phase of waking from naps after 40 minutes which I think is one sleep cycle and I read that waking him slightly after 30 mins and letting him resettle himself. Don't wake enough for them to be fully awake, I just would change his position and he'd stir and go back down. I did that for 3 days and then he started sleeping for a couple of hours nap.
I know it was for naps and not his main sleep but I'd think theory is the same?

Might try that thank you. It definitely feels like something is just waking her every 40-60mins and she needs help going back to sleep when previously she settled herself fine.

Just a quick update for you. Last 2 nights have been much better. Only wakes twice for feeding but settles herself back to sleep just like she used to.

I'm not sure if it's because I adjusted the timings as suggested or her cold is starting to get better but she suddenly seems to have remembered how to self sooth. I put her down awake and she smiles and rolls onto her side and goes straight to sleep.

Fingers crossed it lasts. Thank you all so much for your help. It's amazing how much better you feel after a little bit of sleep.