Three things to consider:
1) Latex or silicone
The taste of the nipple changes according to the material it is made of. Latex is softer and less rigid than silicone, making it easier for the baby to squeeze down. Latex is also stickier, making it easier for the baby to detect the nipple’s position in the mouth.
2) Wide or narrow base
The wider the base of the nipple, the easier it fits the baby’s mouth and lips. The better the infant latches on, the more efficient the feeding.
3) Slow, medium, fast, or variable flow
The nipple can have one or more holes or an X- or Y-shaped slit. The wider the hole, the more milk flows out. For nipples with a slit, the direction of the slit will determine the amount of milk the infant gets when the nipple is squeezed against the roof of the mouth. The output of slit nipples is therefore harder to control.
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