The material of the teats and cup is of the highest quality and depends on how you use your Happymami. Our recommendation, and for greater comfort when using the nipples and greater efficiency, is that you use at least 2 nipples per flow stage, changing them every 2 months, with the optimum being 4 nipples per flow stage.
For hygiene and safety reasons, it is advisable to replace the nipple after 4 to 8 weeks, depending on the frequency of use. Change it as soon as the first signs of deterioration appear.The stages we have are 3, from 0-3 months (slow flow), from 3-6 months (medium flow) and more than 6 months (fast flow).
If in your case it is not possible to have 2 nipples per flow or to change them every 2 months, do not worry, we use top quality medical silicone and they will withstand an important use. And regarding the glass, we recommend using at least 2 glasses per stage, so you will have the best result and maximum efficiency.