Gyn-Ob.com even suggests getting your toddler to nurse to stimulate more milk production for the baby if you find your milk supply to be insufficient. According to Beltran on eHow, tandem nursing mothers usually complain of overproduction rather than underproduction. The only time when a mother might not have enough milk is if she has a medical condition or procedure that inhibits milk production. You can also read what KellyMom wrote about the oversupply of breastmilk while tandem nursing.