Chicco Step up Adjustable Flow Teats 2pcs - 4months+ with non-angled teat is appropriate after 2 months, when colic episodes have ceased. The flow rate may be changed to meet the demands of the infant by twisting the desired flow rate number on the teat beneath the baby's nose. Ideal for newborns in their first few months, when their appetites grow. The step up teat is velvety and resembles a mother's wrinkles.