The product you are referring to is the Philips Avent Natural Response Glass Baby Bottle, 120ML (4 oz).

This is the smaller, newborn-friendly size in the Avent Natural Response glass bottle line.

Here are the key characteristics of this specific feeder:

Brand and Line: Philips Avent Natural Response.

Material: Pharmaceutical Grade Borosilicate Glass, known for its purity, durability, and resistance to heat and thermal shock (making it safe for warming and sterilization).

Capacity: 120 ml (4 oz). This size is ideal for newborns and smaller feedings.

Nipple Technology (Natural Response):

Features the Natural Response Nipple that is designed to release milk only when the baby actively drinks (sucking and compressing the nipple).

When the baby pauses to swallow or breathe (like they do during breastfeeding), the milk flow pauses, which helps them feed at their own natural pace.

The wide, soft, and flexible breast-shaped nipple promotes a natural latch-on, helping with the transition or combination of breast and bottle feeding.

Age Recommendation: Typically comes with a Slow Flow Nipple (often flow rate 2 for the Natural Response line, suitable for babies 0 months and up/newborns).

Anti-Colic Feature: Includes an Anti-Colic Valve integrated into the nipple design to vent air away from the baby's tummy, which is intended to reduce gas and discomfort.