Add water. Easy to digest. For feeding when lactose is a concern. Milk-based without lactose. Breast milk is best for babies. When an infant formula is needed, Similac Lactose Free provides the excellent nutrition or milk protein, but without lactose (milk sugar). Sometimes gas, diarrhea and other feeding problems may be related to lactose. Similac Lactose Free contains easy-to-digest carbohydrates similar to those in Isomil Soy Formula with Iron and is fortified with nucleotides, compounds naturally present in breast milk. Breast milk is recommended.