about how many ounces do I feed my 11 day old baby if I'm trying to use a pump for the first time to bottle fed her?

Normally they eat 3-4 oz at that age @bigfoot

1-2.5 oz still. My daughter wasn't able to drink 3-4 oz in one sitting until she was about 2 months

My son ate 2 oz at that time.

a breast fed baby should only take 1 to 1.5oz for every hour sense they last nursed and never more than 5 ozs at a time