For both girls, it's by their food intake. It at least doubles if not triples.
We picked up the 14m around 5. She had a bottle in the car because she took a long nap and missed her last bottle. Then she ate half a pouch. We got home and nursed on one side. Then, she ate dinner on top of that. And now she's nursed both sides. It's 7pm.
This has been a common occurrence all week. She has taken uncharacteristic monster naps at daycare. And of course night sleep has been horrific.