early morning wake ups!

My baby was brilliant she slept through the night from about 11 weeks and is now 21 weeks. However in the last two weeks she has been fidgeting all night long I feel like I'm always putting dummy in or white noise on to make sure she doesn't wake fully and then come 5.30am is wide awake 😴 I try and hold off on milk and leave her in cot long as possible but only really lasts until 6.15am. Has anyone else gone through this? Any tips? Wish she would sleep till 7am again!