Firstly I want to say my daughter is a really good sleeper, I know that but.. she has always gone to bed between 6 and 7pm and used to wake between 6am and 7am with 2 night feeds around 10/11pm and 3/4pm.
Recently she’s been waking earlier and earlier (4/5am) and we can’t get her to go back to sleep - despite rocking in arms etc she wakes any time you put her in her cot.
It doesn’t seem to make any difference if she sleeps well or badly in the day (we try 3 naps morning/lunch/afternoon). She’s formula fed so we know she’s not hungry.