Feedings for 7 week old? On demand or schedule

Kellie
I was wondering if it's ok to feed my 7 week old on demand. She is past her birth weight she is 7.9 pounds and was born at 5.14 pounds. I was told she needs 8 to 12 feedings a day and I'm wondering how that will work if she's feeding on demand since she still sleeps quite a bit during the day. She is also formula fed since I've had problems producing breast milk from day one. Please don't sham me for formula feeding. Just want opinions and others experiences with feedings for your little one. 
Thanks in advance! 
My little one Lexi! 💗

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