The present invention relates to an infant feeding warming system useful to repeatedly and precisely warm breastmilk or formula for use in the NICU. The shaft surface has a first part that lies closer to the longitudinal axis of the bore than a second part, when the shaft and housing are assembled. A top ceramic substrate comprises a top conductive plate to form a first RF ground plane. The heating chip is disposed on the heat transfer portion and is configured to heat the heat transfer portion.