LuvLap 4 in 1 Steel Feeding bottles cum Sippers are ideal for a baby's consumption of mother's milk, formula feed, Juice, and other liquids. The body of the sipper is made of rust-free SS304 steel. It is odor free also. The liquid in the sipper can be consumed through the nipple, spout, or Straw. All these come with an anti-colic venting system. Moreover, he/she can sip from it directly once they are trained to sip from a tumbler.