The Natural S-bottle comes in 170 ml and 250 ml, the Wide S-bottle comes in 200 ml and 310 ml.
The smallest sizes (170 ml and 200 ml) are mostly used in early on, just after birth. After a while, your baby will start to drink more. That’s when you can switch to the Natural 250 ml or the Wide 310 ml S-bottle.
The Wide 310 ml bottle is also available as a porridge bottle. The follow-up bottles of the same type differ only in capacity