The approximate composition of these formulas expressed in percentages is as follows: 

----------------------------------------
FORMULA.    Fat.      Sugar.      Proteids.
----------------------------------------
I.       1.00     5.50       0.33
II.       1.50     6.00       0.50
III.       2.00     6.00       0.66
IV.       2.50     6.00       0.80
V.       3.00     6.50       1.00
------------------------------------------

Second Series

Formulas for the Early Months from 7-per-cent Milk

-------------------------------------------------------

----
I.      II.      III.     IV.      V.
-----------------------------------------------------------
7-per-cent milk      2 oz.   3 oz.   4 oz.   5 oz.   6 oz. 
Milk sugar           1 "     1 "     1 "     1 "     1 "
Lime-water           1 "     1 "     1 "     1 "     1 "
Boiled water        17 "    16 "    15 "    14 "    13 "
-----------------------------------------------------------
20 oz.  20 oz.  20 oz.  20 oz.  20 oz.
-----------------------------------------------------------<

/pre>
The approximate composition of these formulas expressed
in percentages is as follows: 
----------------------------------------
FORMULA.    Fat.      Sugar.      Proteids.
----------------------------------------
I.       0.70     5.50       0.35
II.       1.00     6.00       0.50
III.       1.40     6.00       0.70
IV.       1.75     6.00       0.87
V.       2.00     6.50       1.00
------------------------------------------
How is one to decide whether to use the First or
the Second Series of formulas?
With a large, strong child, having a good digestion
one should use the First Series.  With a smaller,
less vigorous child, whose digestion is not so good,
or with one who does not do well upon the First Series,
the Second Series should be used.
Why is it necessary to make the food so weak at
first?
Because the infant’s stomach is intended to
digest breast milk, not cow’s milk; but if we
begin with a very weak cow’s milk the stomach
can be gradually trained to digest it.  If we began
with a strong milk the digestion might be seriously
upset.
How rapidly can the food be increased in strength
from Formula I to II, from II to III, etc.?
No absolute rule can be given.  Usually we begin
with I on the second day; II on the fourth day; III
at one week or ten days; but after that make the increase
more slowly.  A large infant with a strong digestion
will bear a rather rapid increase and may be able to
take V by the time it is three or four weeks old. 
A child with a feeble digestion must go much slower
and may not reach V before it is three or four months
old.
It is important with all children that the increase
in the food be made very gradually.  It may be
best with many infants to increase the milk by only
half an ounce in twenty ounces of food, instead of
one ounce at a time as indicated in the tables. 
Thus from 3 ounces, the increase would be to 31/2
ounces; from 4 ounces to 41/2 ounces, etc. 
At least two or three days should be allowed between
each increase in the strength of the food.