How much to feed my BP??

I recently brought a roughly 12-18 inch baby ball python home from petco. The first weeks feeding it refused food. Today I gave it a small white fuzzy baby mouse that they sell at petco. It took it a few minutes but it ate it. I checked once after about 15 moored the mouse was still there. Checked again and thought the snake was laying on it but the mouse was gone. I didn't think the snake (Angle by the way) could swallow the mouse that fast but I guess so. My question is should I be feeding Angle a bigger mouse or maybe more?!

I would feed it once a week. Feed it a prey item about the same size around as the widest part of its body. You need to double check everywhere in the cage and make sure the mouse is gone because it will eat your snake if it gets left in there for a long period of time.

The mouse was dead and I fead angle in a separate box.

At the size you described I think 1 hooper mouse every 5 to 7 days will work well. I had mine on one hopper every 5 days schedule and she shot up quickly. As the snake grows a little increase the size of mouse until you are ready to switch over to rats. Mine is right at 400 grams now and I feed it rat pups that have just opened their eyes about a week before or about 45 grams.