When your litter of puppies start to lap from a shallow bowl, like taking there first drink of water around 3 weeks old (could be a little early or later), then start them on a supplement formula. To help them gain weight and reduce the load form nursing on your bitch try the following homemade formula. This has been used by many Bulldog owners and I use it my self with great results. You may need to make more or less depending on litter size but it should be on this format.
2 cups goats milk, warmed slightly.