Three weeks is a common fussy peak, with longer night stretches just starting.
Around 8 to 11 feeds (about 2.5 to 3.5 oz per bottle feed).
Not yet, milk only is usual until about 6 months.
Every baby is different. These are typical ranges for healthy, full-term babies, not targets. The easiest way to know your baby's normal is to track a couple of weeks and look at the pattern.
Thungu is a baby-tracking bot, not medical advice. If you're worried about feeding, weight, sleep, or development, talk to your pediatrician.