My newborn keeps being sick?

I have a lil girl who is nearly 4 weeks old shes fed on ready made sma milk which she drinks fine bt today she keeps brining it back up. She has been very moany amd crys more than usual today n last nite. She only brings uo little bits bt its everytime i lay her down to sleep shel end up bringin some up and wont settle. I gave her a cuddle for a while to comfort her n she fell asleep and then i put her down n was sick. Shes done it about 5 or 6 times within 6 hrs. Is there something wrong or is it quite normal? She dnt seem to have a temperature nething.