16 mo keeps waking at around 4am

[Tootiefruitie66]

Hi, my 16 mo has been waking for several weeks around 4am and I'm not sure why/how to resolve it. Does anyone have any tips please? Thanks

What's her sleep routine usually?

She normally has 1 nap of you to 2 hours at lunchtime. Then she has a bath and we try for bed at 7pm although it often takes half an hour or so to get her to sleep. We try to let her fall asleep on her own but sometimes she refuse and only fall asleep in our arms. I have got into a bad habit of giving her milk when she wakes early in the morning to try and get her back to sleep for a while. Thanks