6. Vomiting may mean that the child has eaten too much.
7. Breast milk is the best infant food.
8. No artificial food can or should be trusted which does not contain the essentials of breast-milk—viz., fat, proteids, and sugar.
9. The elements named are to be found only in milk, cows’ milk being the only one available for general use.
10. Cows’ milk must be modified, because it does not contain the same proportions of the elements named.
CONSTITUENTS OF GOOD MOTHER’S MILK.
Reaction Alkaline.
| Contains | 3 to 4 | per | cent. | of fat |  | Sp. gravity 1030. |
| “ | 6 to 7 | “ | “ | of sugar | ||
| “ | 1 to 2 | “ | “ | of proteids |
Inorganic materials ¹/₁₀ to ²/₁₀ of 1 per cent.
Average percentage, 12 per cent. of solids to 88 per cent. of water.