Sleeping time off

Nikole
My almost 20 week old has been getting up around 5 am every morning when she used to wake between 6am and 7am. She just lays in her crib wide awake for like 20 min then I get her and feed her. I've been doing same sleep routine except now she doesn't need to be rocked to sleep so we just put her In her crib at 8 and she used to sleep till 6 or 7. Wake up maybe twice for the paci early on in the night. Is there anyway I can get my baby to wake even a hour later? Anyone else going through this? She's been quite grumpy during the day also cuz she takes several 30 to 40 min naps a day. It's exausting.