Crate
These are useful when leaving the baby for a little while, they can stay in this and be safe from getting into anything that could harm them. The playpen is good for the same reason as well. Crates are also good if you decide you want to crate train the puppy. Dogs naturally don't want to use the restroom where they sleep. Using a crate for potty training teaches them to hold it for longer periods at a time, especially during the night until you let them out to go potty in the morning. Dogs in the wild sleep in small dens so this small space makes them feel comforted and safe NOT confined or unhappy.