Is baby biting their fist? Opening their mouth? Sticking out their tongue. Do they have a tongue? Are their eyes open? Are they closed? Did they blink? Did they move their body in any way? Did their foot twitch? Did they move their arm? maid of honor wearings backtracking to 1920
These are tired signs.
This means baby is tired.
You have a .36th of a second window to get your baby into their cot.