Aptamil gold +

Selma

I have my 4 day old new born on the aptamil gold + since i cant breastfeed and shes constantly hungry. I give her as the packet says 1 scoop on 50mls of water, she has that all and then an hour later shes screaming because shes hungry again. I feel like the worst person ever because i dont know what to do or who to call, if anyone can please help.