You puppy will eat around 120 to 200 gm of food in a day, which depends upon its activity and health. You can feed your puppy with Royal Canin Labrador junior food. Which will provide all the nutrition required by your dog at this age. Check for the deworming of puppy, if not done get your puppy dewormed. Feed your puppy in small meals, 3-4 times a day which will help to gain weight and easily digest the food.