If baby is having trouble breastfeeding, then it is possible to use formula en route to helping mom and baby breastfeed.

Three primary ways I have seen this tip in action.

The first way is to drip some formula onto the breast, and let the baby suckle on/taste it for a few moments before baby goes open mouth.

The second way assumes that the baby is crying hard; soothe the baby first by dripping a small amount of formula in her mouth.

The third way is to top off breast milk with formula. This way, baby will get a full meal, and will be more likely to wait the full length of time till the next feeding session.