13 weeks / 7 weeks corrected: sleep & growth spurt

[Newatthismummy]

My little girl is 13 weeks / 7 corrected and is in no sleep routine at all. I’m aware for routine that if you want to introduce it, it’s from approx 6 weeks (corrected) but it’s unlikely to have any impact until 12 weeks.
Have those with prem babies found the same? My DD will only sleep at the end of a feed when on the breast (I am guessing there is comfort sucking there, she refuses dummies) or if being held by me, or if in her carrier.
It’s almost impossible to get her to sleep - night or day - otherwise.
And there’s no eat or sleep routine... I’m feeding on demand to keep ensuring she’s putting on weight...
I’m aware none of this is sustainable and would welcome experiences from others.
Am wanting too much too soon? I don’t want to push her as she’s done so well since her arrival...

Completely off subject, but I keep getting different advice...The 8-10 week growth spurt...Would I go off actual or corrected age for this? I am guessing actual.

Thanks in advance

[NoIDontWatchLoveIsland]

DD was 6 weeks early and yup you are expecting too much too soon. Even ignoring prematurity (DS was term and was exactly the same) you basically get nowhere with routine til about 3-4m when you start needing to actually "put them down for naps" because they don't just sleep anywhere all day. Then 4 month sleep regression trashes it, and you spend the next 2 months trying to get it back. Things start coming together properly around 6 month mark.