I truly feel for you! I also had to move home with my parents during my divorce yet I did not have a new child. I can't even imagine. Living with my parents was helpful, yes, but in someways I found it hard to grieve the way I needed to, it was like I was being watched. In retrospect though, I'm so thankful I had them during that incredibly difficult time. It allowed me to grieve without worrying about little things - even grocery shopping. I could kind of be in 'lala' land so to speak. I'm sure you'll appreciate the help too that they will be able to provide for the baby.
So, what did i do... well, for starters, I accepted help from others. I was overwhelmed and humbled by the outpour of love and support from family, friends and even strangers. Accept it, it helps and makes you realize how special you are and how strong you are.
Another thing I did? I celebrated myself each month and had a 'goal'. Everyone told me the first year is the hardest and that each month things would get a bit better. My DDay was on the 31st, and I couldn't STAND the pain, I just wanted to feel better.
SO, I knew that this was a marathon not a sprint. So I marked the 31st of each month (or earlier on months that ended earlier) and I 'celebrated' getting through another month! Go me! One down, only 11 to go, 10, 9, etc. until I knew I would feel better again. And I gave myself ONE goal each month - like to either sell the car, or something simple like, read a book, all kinds of mini goals and then I 'celebrated' getting through another month with a mani/pedi, etc.
I also went for really long walks. Like, for hours. I would turn pandora on and walk for hours - it helped me to think through things. I also did some writing to get the 'gunk out' so to speak.
The thing is, now is a hard time, yes, but it's a chance to really just focus on you and be selfish. Truly. Get to know yourself again and love on you. And wrap yourself up in your daughter :)
Sometimes it really is about getting through the next minute, let alone the day or week. I wish I could make it easier for you but the only way out is through. By properly allowing yourself to grieve too you'll be better, healthier and happier in the long run.
Good luck, you can do it and we are all cheering you on!