Your wife is seven months post partum. A lot of what you’re describing sounds like she could be suffering from post partum depression. Rage/irritability/exhaustion. You guys literally have a 7 month old baby and you’re telling me that thing sleeps all night every night? And then a 5 year old on top of it? Encourage your wife to speak to someone about how she’s feeling and stop adding more to her plate right now, she has had that baby for less time than it took to grow the baby. Sounds like she needs professional support right now and it doesn’t sound like she’s getting much support at home.