i am so sorry, i couldnt click this post and not say anything. You are coping with a double whammy here, the loss of your loved one and the birth of your baby - i hope you are getting support in RL from your friends and family, the health visitor, your gp etc...
i have no idea how you cope with the loss of a partner, but i lost someone incredibly dear to me in 2004, and all i can say is you just keep breathing, and it gets easier, over a long time, it gets easier.
accept all offers of practical help that you can
do what ever feels right for you
for me, i felt the pain, talked about it, cried alot, and didnt feel guilty for doing it. i had alot of stop the world i want to get off moments....
but 8 years on, its easier. it does get easier to live with.
you have my very best wishes, xxx