OP, unless wife is just plain nuts, this is about a lot more than spilled milk. Unfortunately you are due for a heart to heart conversation to unpack what is going on… Do not chase her down or leave frantic messages on her phone. If she’s going to come back she will without all that. And if it takes that to get her to come back, she won’t be staying… By the way, women can have midlife crisis too. I don’t know her age but this sounds like one... OP, when she does come back, find a time when the two of you can calmly discuss what’s going on. It may be a very important discussion.

Hopefully she'll cool off and come back. You both then need to book a drs appointment to discuss post natal depression. A decent therapist and maybe some medication should be able to put you both the right way up again. Please don't judge her too harshly for the emotional mushroom cloud. You don't get much warning about what is going to trigger something like that and she's hopefully feeling far worse about it than you could ever make her feel. I say hopefully because how bad she's feeling about it is how deep she actually loves you both. Get the help she, &/or you both, need now and you can salvage everything. Especially if She's been struggling for a while now and this is the first sign of things being in need of immediate attention. If, however, this is a know behaviour pattern that you never thought she'd turn on her child or she swans back in acting like absolutely nothing just happened... *Then* you divorce her and take full custody because being subjected to that level of unpredictable emotional brutality is a living hell for kids and you won't be able to stop her damaging your child for life.

Take your son and run away away fast from that psycho bitch.

Sounds like a post birth depression. Once she calms down, you should really have a heart to heart conversation with her and get her the help she needs.