Get a freebie Green to Grow wide neck silicon nipple from Biome.
To get them add them to your cart and checkout. Will put expiry date at the end of the month as I think they'll have run out by then.
The nipples are free of nitrosamines, a potentially harmful contaminant found in many rubber nipples. Green to Grow use 100% recycled paper and soy inks in all of their packaging. Green to Grow have partnered with 1% for the Planet, pledging to donate 1% of their annual sales to environmental causes.