Knowing exactly when baby's feed is at the right temperature can be a challenge. NUK First Choice+ baby bottles now have a built-in Temperature Control indicator located on the bottle's graduation marks that changes colour from blue to white when the bottle's contents are too hot (above the optimal feeding temperature of 37 degrees), so you can be sure your baby's milk is always at a comfortable drinking temperature. This bottle is the ideal choice for combined feeding* as the NUK orthodontic teat simulates the shape of a mother's nipple during breastfeeding which gives baby a natural and familiar drinking sensation. The innovative teat also minimises colics** thanks to the NUK Anti-Colic Air System that ensures a natural flow to help your baby drink without swallowing air. Dimensions: 6.6 x 20 x 13.1cm Capacity: 300ml Material: PP Plastic and Silicone Pack of 2.  *Scientific study: Moral et al. BMC Pediatrics 2010, 10:6.For more information go to http://nuk.com/research  **Independent market research among 205 mothers, Germany 2018. 99% of the mothers confirmed that the NUK First Choice+ Control bottle does not cause colic)