Things you must ensure you follow
Sleep is the most important sleeping
Think of human babies and dogs around 3 months old in the same way. Sleep is their job. If they don't get enough sleep, they will lose energy and become ill. Their immune system is also unstable at this age, so create an environment where they can sleep peacefully and quietly until they are about three months old.
Also, too much play or too much attention can lead to a loss of energy, so try to set a specific time and frequency for play, for example, "for 0 minutes at a time, around 00:00 and 00:00".
sleeping hours
playtime
Temperature and humidity management
Eating and staying at home by themselves environment
Feed your dog multiple portions of dog food per day to reduce the strain on the gastrointestinal tract. Select a circle or cage that is appropriate to your dog's size and prepare it for accidents while you are away from home.