It is possible to coparent a newborn, but it can be difficult. There are a few things that you need to consider before you start coparenting. The first thing is whether or not you and the other parent are on good terms. If you are not, then it may be difficult to coparent effectively. You will also need to figure out how you will split up responsibilities, such as who will take care of the baby during what hours. It is important to communicate with each other often so that you can stay on the same page. Finally, make sure that you are both committed to making coparenting work for both of your sake and for the sake of your child.