I also have bipolar disorder, and had a baby 5 months ago. The first 3 months or so were hell. I'm not going to lie, the lack of sleep was horrific for me, to the point that it caused pure rage at times which was terrifying. I knew it would be bad but I didn't know it would be that bad. Having a new baby is extremely difficult for anyone, and having bipolar disorder makes it even harder, but it is absolutely doable and you will survive! Accept any and all help you can from anyone so that you can sleep as close to a normal amount as possible. Your partner being understanding and willing to help when you get to a point of not being able to continue is very important. Make sure if the lack of sleep leads to rage for you like it did for me, that you just leave the baby in a safe place and walk away for some alone time. Around 4 months my son started sleeping 10-11 hours straight at night so lack of sleep is no longer an issue, thankfully.