Spit up


My daughter is 5 weeks old and EBF, except I pump once or twice a day and my husband feeds her a bottle to give me a break. For a little over a week now she is spitting up a notable amount after each feeding, bottle or breast. She is easy to burp and we always hold her upright after a feeding. I know it is normal for babies to spit up, but recently it has been significantly more than before. Does anyone know what would cause this or what we can do to help her?