Hi C.,
I have nursed 4 children, anywhere from 10 months to 18 months, and have experienced low milk production in one breast or the other at least a couple times.
You didn't state how old your baby is, or when you are considering weaning. If you have no intentions of weaning in the next 3 months or so, I would do what you can to bring milk production back up.
You really need to continue nursing on both sides, and pump whenever possible on the side that is low, to bring milk production back up. Your baby may be growing healthy now, but will need more milk than one breast can produce, especially if your baby is under 3 months old, unless you chose to suppliment with formula.
[If you use a bottle, remember to look into a NUK nipple (and pacifiers)- its shaped most like your own, and eliminates confusion with your baby. www.NUK.com]
Plus you have to consider the ability to find a bra that will fit properly with one breast with no milk, and the other full of milk. The breast that is producing milk will become much larger than the other because it will be making 2x the milk than is normal, because your baby will be nursing longer on that one breast, and not on the other.
I understand how hard it could be to bring milk production back up, but it will be worth it, to be able to nurse your baby. You can still keep nursing time shorter on the less producing breast, but do not cut out feedings on that one completely, your baby will need that milk. And you will be more comfortable with both breast producing.
1. Remember to use that breast for feedings, even if there is only a little bit, it will take time to build up to what your baby needs.
2. And pump in between feedings, this will bring production back up close to where it should be. Enough to feed your baby.
3. Start your feedings with the lower producing breast.
Good luck