This baby is KICKING. At first I thought it was exceptionally regular gas, which is a thing I do have, but it so isn’t — it’s a baby. Weird. The most typical description I’ve read for this feeling is usually something insubstantial and vague, such as “butterfly wings” or “fluttering.” Something more accurate (from today’s Reddit trawling): like goldfish swimming around in a plastic water-filled bag, bumping against the sides of the bag.
Anyway, it’s cool. That is all.