I am so sorry you are going through this, but I am very proud you have gotten rid of this vile man. This behaviour would only get worse, I know from bitter experience.
The fact he would go out for food with his family and leave his pregnant partner and her small child with crappy cheap food is absolutely disgusting. He was also very mean to your daughter, a grown man denying a little child a sweet because 'they are mine' is pathetic.
You need to get away from him and his toxic family. Just try to concentrate on you, your new baby, and your daughter. Look at this as a new chapter in your life, build your confidence, and try to get some qualifications to get a better job.
If you are in the caring profession, they are crying out for nurses at the moment. When the baby is a little older, you could go and retrain, they will give you student loans and bursaries to help with childcare.
I was left with 3 children (one was a newborn), penniless with a heap of debt. After retraining, I'm now in a very well-paid job, living life to the full. I have a partner on my terms and don't rely on him financially for anything.
You can do this x