I have an American cookbook published in 1976 that has a section on infant feeding in the back.
The section begins:
"Usually a newborn is allowed to rest for the first 12 hours after birth. Then he is offered sweetened water. His first drink is prepared by measuring 3 ounces of water... into a bottle. Add one tablespoon of sugar and shake gently to dissolve. Put the nipple on and boil the entire bottle and contents for 10 to 20 minutes...
...At about 24 hours of age, a baby receives his first feeding of formula milk unless he is being breast fed, and thereafter he is fed every 3 or 4 hours for the first weeks..."
It goes on to detail 'the formula' for reconstitution the evaporated milk, which was done according to age. This is where the word 'formula' is from.
First Formula was -
6 oz evaporated milk
10 oz boiled water
1.5 Tb sugar or corn syrup
Or
12 oz fresh whole milk (boiled)
4 oz water
1.5 Tbsp sugar or corn syrup
This was to be divided into 2 oz bottles, increasing volume in bottles until the 5th or 6th day until baby took 3 ozs at each feeding.
Later Formula -
10 oz evaporated milk
15 oz water
2.5 Tbsp sugar or corn syrup
And
13 oz evaporated milk
19 oz water
3 Tbsp sugar or corn syrup
Figures for dairy for Later Formula -
20/ 26 oz milk
6 oz water
2.5/ 3 Tbsp sugar or corn syrup
The advice was to gradually stop the 'formula' when solids were introduced, ending up with 1:1 reconstituted evaporated milk or whole milk, with no sugar added.
Solid Food -
"As early as six weeks, the baby may be ready to try solid food - strained fruit, cereal, or egg yolk. Begin with a teaspoon at a time, and mix food with formula to thin it...Avoid making an issue of getting food into the baby and try again the next day [if baby rejects solid food]...
... Soon after becoming accustomed to fruits, cereals, and egg yolk, the baby will be ready to try strained vegetables and meats. Hard toast and zwieback should be introduced when the baby's first tooth appears..."
It's a wonder any of them survived.
I'm not sure when this advice was originally compiled. The Settlement Cookbook was originally printed in 1901, and recipes were added and deleted in the many later editions over the years.
My own edition was from 1976 and this infant feeding section was possibly well outdated by then, though my exMIL took it as a given that my DC1 would be fed evaporated milk/water/sugar, with orange juice to counteract the inevitable constipation, in 1990.
She had her family in the 50s and 60s.