Newborn puking?

So baby girl is 9 days old, and this is the third time she has puked after or during a feeding. This morning I pumped out a full bottle to ensure my let down wouldnt be as strong. Well baby girl was eating and eating and all of sudden she puked everywhere. Not spit up, it’s like everything she ate came up. Can newborns over eat? How can I stop this? How soon after she does this should I try to feed her again? I’m just worried she won’t gain any weight if this keeps happening, she was only 6lbs at birth...