Fenugreek didn't help much when I had milk supply issues, but it's very inexpensive and harmless, so give it a go. If you really want to increase the supply, I think you may have to increase the nursing. Are your babies complaining during or after nursing? If you think it's more milk that they want, you can follow up a nursing session with a little cow's milk in a cup or sippy. But please consider allowing them to continue nursing even if you feel like you are "drying up," because there is sooo much more to nursing that just the milk, especially as they grow into toddlers.
Maybe your babes aren't even really missing the milk much.
You know, even with very little milk, many babies enjoy the snuggly comfort, the routine, the closeness and security, hearing your heartbeat while you stroke their hair or kiss their faces. It calms them when they are stressed out, lowers their cortisol levels (the "stress hormone"), and even regulates their heartbeat. The psychological needs that are fulfilled with nursing are just as important as the milk, maybe even more at this age.
I know some mothers wean their babies when they feel they are "nursing for comfort, not for milk," but it seems misguided to me. Perhaps you have heard the expression "I stopped nursing because she was using me as a pacifier." To which I have found this wonderful response:
"You are not a pacifier; you are a Mom. You are the sun, the moon, the earth, you are liquid love, you are warmth, you are security, you are comfort in the very deepest aspect of the meaning of comfort.... but you are not a pacifier!" -- Paula Yount
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Here's what the kellymom website says about comfort nursing
"Comfort nursing is normal. If baby were not comfort nursing he would need to be sucking on his hands or on a pacifier. The breast was the first pacifier and the one that all others are modeled after, so don't be afraid to allow baby to use it in this way. There are studies that show that comfort nursing is healthy for your child, too. All babies need to suck - some more than others. It ensures that they survive. If your baby seems to be comfort nursing *all the time* and this is more than you can handle, keep in mind that this will probably ease some as time goes by. In the meantime, you may find that carrying baby in a sling or a carrier on your body will lessen his need to comfort nurse so much. He may just need to be close to you at times and seeks out nursing as a way to do that.
"Comfort nursing serves a purpose, too. Studies seem to indicate that this type of sucking overall decreases a baby's heart rate and lets him relax. It seems to have a very positive effect on his whole physical and emotional well-being. Don't be afraid to allow this type of nursing. Breastfeeding is more than just imparting fluids and nourishment. It's a way to nurture your child as well."
http://www.kellymom.com/parenting/sleep/comfortnursing.ht...