Thinking about ending my marriage

Wife was always mad, moody at me for no apparent reason. More obvious ,after she gave birth to our daughter last month. Im doing everything i can, i cook everyday, i clean, i take care of kid but if somehow i do one thing wrong (didnt wash the clothes properly, didn't put the towel properly,she will start to freak out. Example of things that she do or said during one of her episode is like saying she want to die, saying just kill her, saying why she still alive. Im tired, never i have ever hit her or raise my voice blatantly to her . Thinking about divorce but also thinking about my daughter hmm.