can i used 5 treat philips avnet niple for 6 month baby? and without using 4 treat can a baby directly go 3 treat to 5 treat?

A. That depends upon your child if your child is comfortable then there is no problem because every child has its own way of kids are very comfortable with the changes that you make without any hassle and some kids face problem so if you want to change you can but I cannot confirm about it