This baby is drinking very well at the breast. The pause in the chin as the baby opens his mouth to the maximum, just before closing his mouth, indicates his mouth is filling up with milk; the longer the pause, the more milk the baby is taking in. Thus, it is obvious that the advice to feed the baby 20 minutes (10 minutes, 30 minutes, whatever) on each makes no sense. A baby who drinks as this baby drinks for 20 minutes on the first side could easily refuse to take the second side since he would be full. Even a shorter period of time drinking as he does could easily fill him up.