Enfamil Enspire Non-GMO Powder, 20.50 ounce (581 g) tub, makes approximately 147 fluid ounces prepared formula. 2,940 calories per tub. Enfamil Enspire is a 20 Cal/fl oz milk-based, iron-fortified, routine formula for full-term infants 012 months. Enfamil Enspire has two components previously only largely available in breast milk: MFGM to foster cognitive development and lactoferrin to support immune health.