I should also add - I've never been a stay at home mom. While I've exclusively breastfed both kids, and take care of them when I get home from work, or work from home when their sick (I switch at times with hubby on who stays home), I find the people who avoid going insane are those who ask for help or get help with the kids. Not sure how newborn the newborn is, but if you are able to join meetup, and find some mom groups to set up play dates for the 1st born, you will be able to get some sanity back. Staying cooped up in the house is not your friend. If you do have any relatives that want to visit, and they ask what they can do to help, ask them to vaccuum, do dishes, bring food, anything to get through the first few months. Even if you don't want to burden them, anything who loves you or has kids, totally gets it - and totally will not mind.