I'm experimenting with bottles and I think my ds likes the Playtex nursers with the liners. However, I don't like having to buy the liners or how you have to fill them and push out the air, etc. I don't think he's necessarily getting less gas with them, but he likes the softer nipples. Do any other bottles have that soft of a nipple? And I think he likes it wide as well. I've bought a couple different bottles now and none of them are as flexible as the dropins nipples, not even the Playtex VentAire ones. I have Avent bottles originally and would like to try the new "so soft" nipples, but have only seen the slower flow nipples in the soft version. Do the #3 and #4 flows come in the softer version? Anyone seen them?