feeling crap

so my baby girl is 5 weeks old! She's developed a cold! Has a cough a little stuffy nose and just isn't feeling herself ! My boyfriend it blaming me for her Having this cold and I honestly feel awful! He constantly always has to find something wrong with my mothering ! No matter what is wrong with her it's my fault ! I can't help but feel I'm trying my best for my baby and I love her with all of my heart! He's taking away the most precious first few weeks from me !