From 3 oz to 9 oz: sizing the bottle to the stage

We make bottles in 3, 5, 7, 8 and 9 oz. That is not five ways to sell the same thing; a newborn feed and a nine-month feed are different jobs, and a bottle sized to the feed is easier to warm, easier to hold and wastes less.

3 oz: the first weeks

Early feeds are small and frequent. A 3 oz bottle fills to a newborn portion, warms through quickly, and is small enough to look sensible in tiny hands. Ours ship with the Level 0 extra slow nipple. Once feeds outgrow it, the 3 oz stays useful for water later on.

5 oz: the workhorse

From around a month, most feeds land in 5 oz territory. This is the size we make in the most colours and packs, in glass and PP, because it is the one that lives in the steriliser basket for months.

7 to 9 oz: bigger feeds, fewer of them

Past three months feeds get larger and further apart. The 8 oz glass carries a Level 2 medium nipple out of the box; the 7 and 9 oz PPSU bottles cover the same stage for parents who want the lighter material. From six months the 9 oz weighted straw cup joins in for water alongside meals.

Our rule of thumb

Size the bottle so a normal feed fills most of it. A bottle routinely a third full is a size too big; a bottle your baby drains and complains at is a size too small. The flow finder sorts the nipple side of the same question.