The larger size babies may prove to be males but this is dependant upon age, feeding, etc. These frogs need to be able to get out of the water. The water container should be cleaned and refilled daily. They are a hardy frog so even novice keepers can maintain them with a minimum of experience and a little research. The vendor should be able to provide you with the basics.You should have all of your housing issues and concerns addressed prior to getting the frogs.