On the use of the feeding bottle we must make a distinction.
If a child is breastfed, the bottle will perhaps be useful from the 6th month onwards, when weaning begins and it is necessary to give those liquids that the child no longer takes with its mother's milk (water, but also freshly squeezed orange juice, fruit tea...).
For a baby breastfed with formula milk, on the other hand, the use of a bottle is necessary from the first days of life [read more about how to give a bottle]. (In this case, the 'size' of the bottle spout will be 0 or 1. As time goes by, the size, i.e. the size of the hole through which the liquid passes, is increased to better meet the baby's needs and capacity).
In both cases, we advise you not to use the feeding bottle beyond 12 to 15 months (or limit it to the need to take liquids if you have difficulty using the cup, glass and spoon).
As an alternative to the bottle you can give a small glass with a little water, to get the baby used to drinking from the glass, or you can use a small water bottle. At first he will drink with your help, gradually stimulating the child to make the gesture of bringing the glass to his mouth with you, and finally independently.
There are different types of feeding bottles and teats on the market, varying in materials and type: we advise you to try one type and then, if necessary, try other solutions (better if they are made of materials (e.g. silicone) suitable for microwaves (should you need to heat the milk) and even more dishwasher safe).