thank you First Years! The breatflow bottle is the only bottle my breastfeed baby will use!  this is the best bottle on the market.  I have tried EVERY bottle and bottle nipple on the market she wouldn't take them- pushed the nipples out wih her tongue.  She immediately latched onto this nipple- the nipple is softer and conforms to her mouth.  I was able to attend a wedding and leave her at home cause of these great bottles.  This is an excellent bottle for breast feeding moms!