My baby’s poo smells like rotten eggs

Breast fed and only 1.5 weeks old. I thought breastfed babies poo wasn’t supposed to stink? Its yellow, curdy and a little liquidy which I’ve read is normal for a breastfed baby but the smell is horrible. I haven’t eaten much dairy if any at all. She also seems very uncomfortable and possibly in pain when she goes. She whines and whole face gets red..