Regardless of which feeding philosophy you follow, you cannot add to what nature has left out. The anxiety created by the fear of failure (and in some cases, the fear of judgment from others) is a contributor in its own right to milk deficiency.
In most cultures, up to 5% of women during peacetime and 10% during wartime are not able to produce adequate milk for their infants. Some mothers experience sufficiency that wanes to insufficiency by the third month. This can take place in spite of having all the "correct" pieces of the puzzle in place: appropriate rest and nutrition, good latch, nursing frequently enough, and sufficient support from family.
If you question your milk supply at any time, observe the following:
Is your baby routinely fussy after every feeding?
Is he having difficulty going the appropriate duration between feedings?
How is the stress-level in your life (this can affect the taste and production of milk) and in your home (which can affect your infant directly)?
If you've eliminated what you can and you're still unsure, consider the following:
If you question your supply in the first 2 months, consider feeding on a strict 2.5 hour routine for 5-7 days. If your milk production increases (demonstrated by your baby being more content and sleeping better), work your way back to a 3-hour minimum. If no improvement occurs, supplement with a formula to give you peace of mind and your - continued below ...