I am particularly sensitive to the small 125 ml bottle format (very handy and light), and the shape of the teats tips, that actually recalls the shape of maternal breast. Indeed, it is ideal for mixed use breastfeeding / bottle. That said, that moms who immediately chose to bottle-feed at birth do not feel guilty: these bottles will go perfectly! ;-))
I do not know if it's really the shape of the nipple or valve system but I have found fewer referrals in my little "tester".
If they are especially well designed for use from birth, I also find them very convenient for a leisurely walk (not bulky, strong, lightweight, full ...).
The planned brush is a good idea, as no need to look for one, and this one is well suited to form. So, no need to take the lead in finding a suitable one: absolutely everything! This is not negligible, at a time of life when it was necessarily much to do and think !!!
In short, excellent quality, capacity and ergonomics, perfect kit BPA. I love it !!!!