We’ve had a consistent routine for ages bedtime 7pm usually baby wakes up for feed about 3am sometimes doesn’t wake and wakes about 7/7:30am and now suddenly baby is waking at 12:30/1am for bottle and then wakes for the day at 5:30am and can’t get him back down..Can anyone shed any light on why this would happen? Is there anything I can do to push his wake later?
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Following. My 5 month old has consistently slept through (currently pulling bedtime earlier) 7.45pm-8am ish.
He keeps waking around 4am for a feed.
I was told it could be delayed sleep regression that is said to be 4-6 months x

It is a regression in my opinion, it's my second baby and I remember I had similar experience with my first. We are in the same boat, usually going to bed between 7:30/8pm and only wakes up once for feed but now waking up constantly I mean every 1:30/2 hours and needs comfort before going back to sleep, it's exhausting but I am hoping it will pass quickly.

Have a look at daytime sleep. I found when baby was going from 4 to 3 naps we had earlier wakeups until we dropped the 4th nap. We are also currently getting an extra wakeup for a feed but she's genuinely hungry so I think growth spurt.