At around that month, I just used to feel extremely tired. I'm breastfeeding my baby too. But never did I experienced tightness of chest. Are there any other symptoms you're feeling? It's best to seek medical help, I suggest.
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Tightness of chest isn't a common thing to be experienced by a mom, or even any person, I guess. I suggest you have yourself checked ASAP so you would know what your condition is.