My answer today:
Because six hours earlier, this little guy was still in that belly up there.
And because in dinner conversation with horse friends recently, I was talking about the problem I had in taking care of an infant (human) during an emergency. I said “He hadn’t been weaned yet, and his mom wasn’t able to pump any breast milk because it was an emergency. Poor little guy was stunned by no mom and the sudden appearance of icky stuff in a bottle.”
I looked up, and realized none of us had caught my use of the term “weaned”: like you would wean a foal. We were all just going with the program.