Our two-month-old daughter is formula fed. My wife and I prepare a batch of bottles every day using this formula mixing pitcher so they’re readily available at feeding time. Some arithmetic is needed to work out how much formula powder to add to a certain volume of water, and the amount of formula we need to prepare steadily increases as she grows. To give our sleep-deprived brains a break and avoid any miscalculations, I created some shortcuts to help out and do the math for us.

Formula Calculator works out how much formula we should prepare for the day, based on our daughter’s current weight (in pounds and ounces). The general rule of thumb for babies up to six months old is to offer 2.5 ounces of formula per pound of body weight in a 24 hour period. Her weight is entered when running the shortcut, along with how many feeding sessions to expect that day ^{1}. The amount of formula to prepare, along with how much to fill each bottle with, is then displayed.

This next shortcut, Formula Prep, is the one I use the most. It calculates how much formula powder to add to a specified amount of water. Most formula powder in the US specifies one scoop (8.7g) of powder for every 2 fluid ounces of water. I specify how much water is in the pitcher and it calculates the amount formula powder to add—both in grams and scoops. I prefer to measure by weight as it’s all too easy to lose count of the scoops being added.

Prepared formula can be stored in the refrigerator for up to 24 hours. After that, it must be discarded. Formula Reminder is a shortcut I run once I’ve prepared formula that creates a reminder with an alarm set 24 hours later.

- The number of feeding sessions can vary from day to day. We’ve been tracking our daughter’s feeds since birth and she’s currently averaging about six sessions per day. ↩

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