The Capital Region International Airport near Lansing Michigan DOES NOT have a dedicated nursing mothers room.
However until they create one required by a federal bill waiting for approval in US Congress (Friendly Airports for Mother's Act), there is a spot in the woman's restroom that has seats.
It's in no way ideal or sanitary but nursing moms can use it or call (517) 321-6121 or ask airport staff for help finding a more vacant and private room to breastpump or breastfeed their infants.