I am in the exact same situation as you with my little one arriving in May. My wife and I purchased a RAM for the family and I am hoping to pick it up this weekend. After much research on this forum, I decided to go with the Lomax hard tri-fold bed cover. I have it in the box and ready to install. The reason I went with the Lomax is because the users on this forum like it a lot and I like the hard nature of it. Should hold up to snow sitting on top also I hope. In addition, I have watched some videos on it and it will pop off very easy for when I need to hold large items and use the truck as a truck.
One thing I am also doing to help my wife (and the short nature of the bed) is I also purchased a AMP bed extender. This will not only allow extra bed space with the tailgate down but, just as important, we can flip it inside the tailgate and create a compartment for smaller items to fit close to the tailgate so that we do not need to get inside the bed to get the baby bags and stroller and such. It will be held close to the tailgate for easy access. It also fits under the bed covers. I have this sitting in a box ready to install as well. Here is a youtube video showing someone installing it with a baby stroller in the bed