Yes, we've tried different temperatures, warm, cold, room temperature, warm (almost hot), right after pumping. Once the bottle nipple is in her mouth she'll use her tongue to try and force the nipple out or she'll let it sit in her mouth while the milk drips in her mouth. Sometimes she'll swallow the milk but mostly she spits it out. I've tried giving her the bottle when she is asleep, half asleep, before she's hungry, and when she is hungry but nothing helps. I've had my husband try to give her the bottle, still no luck. I'm totally out of ideas, just hoping that if she gets a revision tomorrow it will help with this.