One of my nephews has never taken more than a 15-minute nap since he left the hospital and went home with his parents. Never. Not in his entire life. He is nine-months-old and sleeps through the night, but is wide awake all day long. He stays home with either one of his parents or his grandparents (who serve as free daycare for several hours a day). His mom uses a breastpump to ensure the kid has plenty of milk during the day.
Well, Lady Quixote recently learned that my nephew got formula at night. Mom didn't want the child to run out of breastmilk during the day (when either Dad or the grandparents were watching him), so she used formula at night. Armed with this piece of information, Lady Quixote and the rest of her family started wondering if this is why my nephew could sleep through the night, but not during days. Turns out my sister-in-law is a caffeine addict. It never occurred to her that whatever drugs she takes would be expressed in her breastmilk. No wonder my nephew never naps – he's been consuming caffeine with every bottle. Then he goes home, takes the decaf formula and, well, sleeps like a baby.
Effective immediately, the kid is on 100% formula.