Constantly spitting up...

Alexis • Im 27, you can call me Lexi 💕 First time mommy to a baby girl 👶🏽🎀 now baby boy 👶🏽💙 Was pregnant with identical twin girls💕 Guardian Angel 👼🏽 4/26/17 Miracle Baby 💕🎀 12/13/17

Last night my week old was up from 2:30-5am crying on and off and spitting up. Idk what can be wrong with her. One of my friends told me my let down can be fast causing her to spit up more. Is it normal for them to spit up a lot? And when she spits up it looks like she just spit up everything she just ate. Do I feed her again? This is so hard for me :(