Blog post from Nancy Mohrbacher on block feeding:
Block Feeding Dos and Don'ts
She says it's normal for newborns to have some trouble keeping up with the flow of milk, and it's not necessarily a sign of OALD or oversupply.
If oversupply is truly the problem, baby will gain weight rapidly. Nancy Mohrbacher recommends block feeding only be considered if baby is gaining more than 7–8 ounces (>200g) per week or 2 lbs per month.It takes practice and maturity for babies to learn to coordinate sucking, swallowing, and breathing during breastfeeding. Some episodes of milk flow struggles and pulling away are completely normal and are not necessarily signs of OALD or oversupply.
She suggests nursing "uphill" if weight again is average, but your baby is having trouble with the flow.If breastfeeding is going well, during the first 3 months, most babies gain on average about 2 lb/mo. (0.90 kg/mo.). If baby’s weight gain is double this or more, block feeding for no longer than 1 week makes sense. If baby’s weight gain isn’t this high, it is likely that block feeding will cause more problems than it solves.
See her post Some Ins and Outs of Laid-Back Breastfeeding for more about uphill nursing positions.What can you do if your baby’s weight gain is average but she is struggling with milk flow during breastfeeding? The best strategy is using feeding positions that give baby more control over flow.