It was pretty warm, today, so this helps to keep the pandas cool. At that time, the mother will mate again, and the infant will be on its own. Yes, pandas are very solitary. Our keepers provide all the food for the adult pandas, and clean their living areas. However, they do not have direct contact, as this might be dangerous.
Pandas are a lot like bears, and can be aggressive.
For baby pandas, sleeping in trees provides added safety from predators. Most of the time, most adults sleep on the ground. This will occur at about 18 months for the infant. By this time, the mother-infant bond has waned and infants are totally independent. The mother will start on her next pregnancy as that time.