My little girl is 11 weeks old and has redness on the skins folds on her neck, it’s quite hard to see. I think it is from milk dribbles or possibly sweat? I have put some sudocream on it (that is the white looking stuff on the picture). Is there anything else that would better to use? Any recommendations please🙏🏻🙏🏻 it doesn’t seem to be bothering her but I just don’t want it to get any worse